# A103433 (b-file synthesized from sequence entry) 0 0 1 1 2 5 3 30 4 199 5 1355 6 9276 7 63565 8 435665 9 2986074 10 20466835 11 140281751 12 961505400 13 6590256025 14 45170286749 15 309601751190 16 2122041971551 17 14544692049635 18 99690802375860 19 683290924581349 20 4683345669693545