# A151523 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 10 5 20 6 48 7 106 8 252 9 578 10 1372 11 3208 12 7584 13 17850 14 42102 15 99276 16 233716 17 550960 18 1295146 19 3050226 20 7161346 21 16846668 22 39511876 23 92845830