# A026397 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 6 4 10 5 17 6 31 7 53 8 92 9 163 10 282 11 492 12 863 13 1501 14 2621 15 4582 16 7987 17 13946 18 24354 19 42489 20 74179 21 129497 22 226000 23 394523 24 688670 25 1202020 26 2098239 27 3662553 28 6392969 29 11159290 30 19478867 31 34000750 32 59349706 33 103596641