B737 FLT CREW DEPARTS RWY 7L AT A6 IN LAS WITHOUT ASSOCIATED DATA.

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WE WERE TAXIING OUT FOR AN INTXN TKOF AT RWY 7L AT INTXN A8 IN LAS. THERE WERE A FEW ACFT HOLDING SHORT WAITING TO TAKE OFF AND AS WE APCHED INTXN A6; THE TWR ASKED IF WE COULD ACCEPT A TKOF FROM THAT INTXN. I REMEMBERED A STOPPING MARGIN OF OVER 4500 FT WITH A REDUCED PWR TKOF FROM INTXN A8. AFTER LOOKING AT THE ARPT DIAGRAM; I ESTIMATED THE RWY AVAILABLE WOULD BE ABOUT 9000 FT FROM INTXN A6. IN MY MIND I JUSTIFIED ACCEPTING THE CLRNC BECAUSE OF THE LARGE REDUCTION TKOF FROM INTXN A8; LACK OF TERRAIN E OF THE FIELD; THE GOOD FIELD CONDITIONS; AND MY ESTIMATED 9000 FT OF RWY AVAILABLE FROM INTXN A6. AS I TOLD THE FO TO ACCEPT THE CLRNC; HE ASKED IF WE HAD THE NUMBERS. I INCORRECTLY ASSUMED THAT SINCE WE TAKE OFF MANY PLACES WITH LESS RWY AVAILABLE AND THERE IS NO TERRAIN; THE COMPUTER WOULD HAVE THE DATA. I COMMITTED A CRM BLUNDER AND DISREGARDED HIS CONCERN ABOUT DATA AND TOOK OFF WITHOUT UPDATING TKOF DATA FROM THE NEW INTXN. HAD I STOPPED THE ACFT AND CHKED THE DATA PER THE FOM; I WOULD HAVE REALIZED THE COMPANY DOES NOT ALLOW A TKOF FROM THAT INTXN. AS MY MIND RACED ON DEP; I REALIZED MY MISTAKE. MY FO DID ASK THE RIGHT QUESTIONS AND I TOTALLY SCREWED UP BY NOT ADEQUATELY ACKNOWLEDGING HIS CONCERNS. THIS IS PROBABLY WHAT I'M BEATING MYSELF UP MOST ABOUT. I DISREGARDED THE BACKUP WHO IS THERE TO MONITOR ME AND BE THE SAFETY NET. I AM AWARE OF THE REQUIREMENT TO HAVE DATA FOR EACH TKOF AND SHOULD HAVE STOPPED THE ACFT; TOLD ATC WE NEEDED TO RUN NUMBERS WITHOUT THE FO ASKING THE QUESTION. I HAD ANOTHER CHANCE TO DO THE RIGHT THING AFTER THE FO RAISED HIS CONCERN. IT WOULD HAVE TAKEN 1 MIN. SUPPLEMENTAL INFO FROM ACN 785595: IN RETROSPECT; THE CAPT AND I AGREED THAT IT WAS A DUMB MISTAKE THAT WAS EASILY AVOIDED. THE CAPT 'ASSUMED' THAT WE HAD DATA FROM THAT INTXN AND I THOUGHT THE CAPT 'KNEW.'