# A024469 (b-file synthesized from sequence entry) 1 1 2 3 3 13 4 19 5 48 6 79 7 176 8 283 9 580 10 940 11 1844 12 2982 13 5667 14 9171 15 17047 16 27581 17 50404 18 81557 19 147090 20 237995 21 424686 22 687158 23 1215528 24 1966764 25 3453733 26 5588259 27 9752641