# A007271 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 -3 9 0 10 0 11 0 12 0 13 0 14 -24 15 -24 16 54 17 0 18 0 19 0 20 -252 21 -504 22 900 23 1152 24 -1452 25 -3312 26 -7344 27 11484 28 35856 29 -30132 30 -50184 31 264 32 -113160 33 175464 34 712176 35 -319098 36 -1997856 37 334320 38 341856 39 1211472 40 13301112 41 -2785392