# A107319 (b-file synthesized from sequence entry) 0 1 1 63 2 1260 3 13860 4 103950 5 594594 6 2774772 7 11042460 8 38648610 9 121671550 10 350414064 11 935402832 12 2338507080 13 5521090680 14 12394285200 15 26606398896 16 54875697723 17 109181751525 18 210275965900 19 393175282500 20 715579014150 21 1270517841450 22 2205030964500 23 3747302149500