# A046916 (b-file synthesized from sequence entry) 0 1 1 5 2 17 3 43 4 97 5 211 6 457 7 995 8 2177 9 4771 10 10441 11 22771 12 49441 13 106835 14 229769 15 491971 16 1049089 17 2228803 18 4719241 19 9962195 20 20972321 21 44041075 22 92275657 23 192939043 24 402654337 25 838862051 26 1744831817 27 3623880115 28 7516194337