# A109876 (b-file synthesized from sequence entry) 1 1 2 3 3 2 4 6 5 11 6 6 7 10 8 24 9 50 10 24 11 15 12 45 13 120 14 274 15 120 16 21 17 76 18 252 19 720 20 1764 21 720 22 28 23 119 24 476 25 1680 26 5040 27 13068 28 5040 29 36 30 176 31 828 32 3520 33 12960 34 40320 35 109584 36 40320 37 45 38 249 39 1350 40 6750 41 29880 42 113400 43 362880 44 1026576 45 362880 46 55 47 340 48 2090 49 12048