# A287318 (b-file synthesized from sequence entry) 0 1 1 1 2 0 3 1 4 2 5 0 6 1 7 4 8 6 9 0 10 1 11 6 12 36 13 20 14 0 15 1 16 8 17 90 18 400 19 70 20 0 21 1 22 10 23 168 24 1860 25 4900 26 252 27 0 28 1 29 12 30 270 31 5120 32 44730 33 63504 34 924 35 0 36 1 37 14 38 396 39 10900 40 190120 41 1172556 42 853776 43 3432 44 0 45 1 46 16 47 546 48 19920 49 551950 50 7939008 51 32496156 52 11778624 53 12870 54 0