RETURN LAND FOR A B737 FLT CREW WHEN THE L MAIN GEAR WOULD NOT RETRACT DUE THE GEAR DOWN LOCK PIN BEING LEFT IN DURING PREFLT PROC AT IND; IN.

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AFTER TKOF FROM INDIANAPOLIS; THE L MAIN GEAR WOULD NOT RETRACT. THE GEAR HANDLE WAS PLACED BACK DOWN AND ALL GEAR INDICATED SAFE. I UNSTRAPPED; GOT OUT OF MY SEAT AND DISCOVERED WE ONLY HAD 2 OF THE 3 GEAR DOWNLOCK SAFETY PINS. I INFORMED THE PAX AND FLT ATTENDANTS OF OUR NEED TO RETURN TO INDIANAPOLIS. UNEVENTFUL LNDG AND RETURN TO THE GATE. THE L MAIN GEAR PIN WAS STILL IN THE GEAR LOCK. I REMOVED THE PIN; TALKED TO DISPATCH; MAINT; AND THE CHIEF PLT ON CALL. WE REFUELED AND DEPARTED AGAIN FOR LAS; NV. WE HAD AN UNEVENTFUL FLT. I FEEL THE FOLLOWING ARE CONTRIBUTING FACTORS: 1) THE VAN SCHEDULED TO LEAVE THE HOTEL DID NOT GET US TO THE GATE 30 MINS PRIOR TO DEP. THE FO FELT RUSHED. 2) THE FO WAS ON HIS SECOND DAY OF IOE AND HE WAS NOT USED TO PULLING ACFT GEAR PINS. 3) THE WX WAS OVCST WITH RAIN AND WINDS GUSTING TO 20 KTS AND DARK. 4) DUE TO A LOGBOOK DISCREPANCY; I HAD TO ENSURE A REQUIRED ACFT INSPECTION HAD BEEN ACCOMPLISHED THE DAY PRIOR; THEREFORE; I WAS NOT AVAILABLE TO SUPERVISE THE FO'S PREFLT -- ALTHOUGH HE WAS PRIOR B737 QUALIFIED. 5) WHEN THE FO SHOWED ME THE GEAR PINS; HE HAD THEM WRAPPED UP IN THE RED STREAMERS; AND I DID NOT NOTICE THERE WERE ONLY 2 VERSUS 3 PINS. 6) WE HAD TO STOW THE PINS UNDER THE FOLD-UP JUMP SEAT BIN BECAUSE THE POUCH BEHIND THE CAPT'S SEAT WAS TOO FULL OF SNACKS TO HOLD THEM. THEREFORE; WHEN WE READ THE 'BEFORE START ORIGINATING' CHKLIST; I COULD NOT PHYSICALLY REACH AND COUNT THE PINS WHEN I ANSWERED 'ABOARD.' TO PREVENT THIS FROM HAPPENING AGAIN; I OFFER THE FOLLOWING SUGGESTIONS: 1) SCHEDULE THE HOTEL VAN APPROPRIATELY. 2) FIND OR MAKE A STANDARD PLACE TO STOW THE GEAR PINS WITHIN THE CAPT'S REACH ON OUR -700 ACFT. 3) ANY REQUIRED MAINT INSPECTION SHOULD BE RECORDED IN THE LOGBOOK FOR THE CAPT TO REVIEW; EVEN IF IT IS RECORDED ON A NON ROUTINE MAINT CARD. 4) EMPHASIS TO NEW FO'S DURING THEIR PREFLT TRAINING THE IMPORTANCE OF PULLING ALL 3 GEAR PINS; PROPER WRAPPING OF THE PINS; AND SHOWING ALL 3 PINS TO THE CAPT WHEN RETURNING TO THE COCKPIT.