# A133643 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 1 5 2 6 6 7 1 8 2 9 9 10 24 11 1 12 2 13 12 14 44 15 120 16 1 17 2 18 17 19 80 20 265 21 720 22 1 23 2 24 24 25 144 26 578 27 1854 28 5040 29 1 30 2 31 33 32 248 33 1249 34 4738 35 14833 36 40320 37 1 38 2 39 42 40 440 41 2681 42 12000 43 43386 44 133496 45 362880 46 1 47 2 48 60 49 764 50 5713 51 30240 52 126117 53 439792 54 1334961 55 3628800 56 1 57 2 58 83 59 1316 60 12105 61 75510 62 364503 63 1441788 64 4890740 65 14684570 66 39916800