# A148283 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 12 5 32 6 92 7 277 8 823 9 2608 10 8602 11 27487 12 91954 13 317118 14 1070466 15 3694465 16 13109697 17 46047042 18 162460455 19 588094407 20 2123508899 21 7635228131 22 28024695724 23 103185183237 24 377404197974 25 1399263641624 26 5225389114090 27 19399013263762 28 72524456841915 29 273643912462107 30 1028680862533408 31 3875666661175306