# A056823 (b-file synthesized from sequence entry) 0 0 1 0 2 0 3 1 4 3 5 9 6 21 7 49 8 106 9 226 10 470 11 968 12 1971 13 3995 14 8057 15 16208 16 32537 17 65239 18 130687 19 261654 20 523661 21 1047784 22 2096150 23 4193049 24 8387033 25 16775258 26 33551996 27 67105854 28 134214010 29 268430891 30 536865308 31 1073734982 32 2147475299 33 4294957153 34 8589922282