# A024459 (b-file synthesized from sequence entry) 1 1 2 3 3 7 4 11 5 26 6 43 7 90 8 145 9 290 10 470 11 904 12 1462 13 2743 14 4439 15 8169 16 13217 17 23970 18 38785 19 69520 20 112485 21 199716 22 323148 23 569232 24 921036 25 1611661 26 2607723 27 4537195 28 7341335