# A006859 (b-file synthesized from sequence entry) 0 1 1 30 2 330 3 2145 4 10010 5 37128 6 116280 7 319770 8 793155 9 1808950 10 3848130 11 7719075 12 14725620 13 26898080 14 47303520 15 80454132 16 132835365 17 213578430 18 335304970 19 515175045 20 776173134 21 1148670600 22 1672307000 23 2398236750 24 3391791975 25 4735616886 26 6533333730 27 8913805255