# A013032 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 32 5 122 6 544 7 2874 8 17536 9 124274 10 997504 11 9112074 12 91956224 13 1034453162 14 12588279552 15 168010601274 16 2388796493824 17 36823967146978 18 598131709419520 19 10446218843141514 20 190679121272193024