# A125658 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 5 4 10 5 24 6 69 7 234 8 914 9 4032 10 19802 11 107041 12 630859 13 4021812 14 27549707 15 201622270 16 1568735464 17 12920985108 18 112241670843 19 1024937136804 20 9809798369155 21 98155778186641 22 1024366679885047 23 11126807259317974