# A056939 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 4 5 1 6 1 7 10 8 10 9 1 10 1 11 20 12 50 13 20 14 1 15 1 16 35 17 175 18 175 19 35 20 1 21 1 22 56 23 490 24 980 25 490 26 56 27 1 28 1 29 84 30 1176 31 4116 32 4116 33 1176 34 84 35 1 36 1 37 120 38 2520 39 14112 40 24696 41 14112 42 2520 43 120 44 1 45 1 46 165 47 4950 48 41580 49 116424 50 116424 51 41580 52 4950 53 165 54 1