# A185998 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 16 5 64 6 308 7 1727 8 11008 9 78244 10 611060 11 5184338 12 47366320 13 462782080 14 4807659368 15 52853722811 16 612426360832 17 7453621425532 18 94997205901940 19 1264555335831662 20 17540102647480336 21 252979919852470672 22 3786896497867089656 23 58733519954606892278 24 942372338052077455168