# A153908 (b-file synthesized from sequence entry) 0 1 1 2 2 1 3 2 4 13 5 14 6 44 7 452 8 799 9 4626 10 86710 11 273752 12 2781435 13 91537826 14 508729354 15 9157300668 16 533484637064 17 5243172893020 18 166735484693868 19 17161483714082216 20 298035643554185774 21 16752470174524734906 22 3047662126271875592300