# A028220 (b-file synthesized from sequence entry) 0 1 1 35 2 770 3 13630 4 212331 5 3041745 6 41087740 7 531634460 8 6658867061 9 81336796255 10 974120693910 11 11484949238490 12 133713902876191 13 1540987906351565 14 17612518552867280 15 199940810374681720 16 2257196040059471721 17 25366166559007515675 18 283993639507153095850