# A150087 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 19 4 66 5 243 6 929 7 3676 8 14808 9 60805 10 252986 11 1065589 12 4536809 13 19477581 14 84303710 15 367160122 16 1608825471 17 7085704233 18 31353847815 19 139335954645 20 621512821655 21 2782177030111 22 12492835133199 23 56262640514675 24 254057915721103 25 1150053975016142 26 5218025470526626 27 23725098445219734