# A156436 (b-file synthesized from sequence entry) 1 1 2 0 3 0 4 3 5 5 6 12 7 54 8 426 9 2334 10 23280 11 152820 12 1939740 13 14564760 14 222925920 15 1890254100 16 33899743010 17 320743643010 18 6597891367200 19 68944295861280 20 1600434039456630 21 18309730315533930 22 473501454337711800