# A000072 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 7 5 12 6 22 7 41 8 72 9 137 10 254 11 476 12 901 13 1716 14 3274 15 6286 16 12090 17 23331 18 45140 19 87511 20 169972 21 330752 22 644499 23 1257523 24 2456736 25 4804666 26 9405749 27 18429828 28 36141339 29 70928099 30 139295793 31 273741700 32 538277486 33 1059051586 34 2084763319 35 4105924366