# A293498 (b-file synthesized from sequence entry) 1 1 2 2 3 5 4 14 5 42 6 132 7 426 8 1390 9 4544 10 14822 11 48183 12 156118 13 504487 14 1627000 15 5240019 16 16861453 17 54228190 18 174351450 19 560481708 20 1801653769 21 5791301311 22 18615976402 23 59841686254 24 192366897839 25 618392292337