# A174893 (b-file synthesized from sequence entry) 1 1 2 -1 3 1 4 2 5 -3 6 1 7 6 8 11 9 -6 10 1 11 24 12 10 13 35 14 -10 15 1 16 120 17 94 18 -45 19 85 20 -15 21 1 22 720 23 756 24 364 25 -315 26 175 27 -21 28 1 29 5040 30 6348 31 2828 32 1729 33 -1120 34 322 35 -28 36 1 37 40320 38 57744 39 27404 40 5796 41 7329 42 -3024 43 546 44 -36 45 1 46 362880 47 572976 48 298980 49 81080 50 -4725 51 25473 52 -6930