# A089087 (b-file synthesized from sequence entry) 0 1 1 1 2 -1 3 2 4 -4 5 1 6 6 7 -18 8 12 9 -1 10 24 11 -96 12 108 13 -32 14 1 15 120 16 -600 17 960 18 -540 19 80 20 -1 21 720 22 -4320 23 9000 24 -7680 25 2430 26 -192 27 1 28 5040 29 -35280 30 90720 31 -105000 32 53760 33 -10206 34 448 35 -1 36 40320 37 -322560 38 987840 39 -1451520 40 1050000 41 -344064 42 40824 43 -1024 44 1 45 362880 46 -3265920 47 11612160 48 -20744640 49 19595520