# A007171 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 16 5 89 6 579 7 3989 8 28630 9 210865 10 1584308 11 12091902 12 93483120 13 730503054 14 5760438853 15 45780146521 16 366304396662 17 2948412461685 18 23857049238752 19 193944769559906 20 1583294537879106 21 12974430494985262 22 106685110047676402