# A063021 (b-file synthesized from sequence entry) 0 0 1 1 2 1 3 2 4 5 5 15 6 49 7 168 8 594 9 2150 10 7931 11 29718 12 112814 13 432957 14 1677050 15 6547856 16 25742454 17 101819100 18 404885630 19 1617725010 20 6491294600 21 26147434885 22 105691660110 23 428578242900 24 1742925259725 25 7106942278683