# A349974 (b-file synthesized from sequence entry) 0 0 1 1 2 5 3 17 4 53 5 147 6 389 7 981 8 2401 9 5697 10 13293 11 30423 12 68745 13 153403 14 339195 15 743169 16 1617857 17 3497875 18 7523697 19 16102889 20 34324847 21 72875031 22 154233691 23 325388121 24 684664081 25 1436991619 26 3009410483 27 6289146455 28 13119434889 29 27319198507 30 56799400255 31 117916622547