# A090031 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 26 5 64 6 159 7 366 8 862 9 1904 10 4538 11 10238 12 24098 13 53186 14 123435 15 268416 16 616374 17 1326882 18 3021126 19 6438828 20 14524718 21 30633586 22 68513713 23 143106496 24 317305688 25 656178756 26 1442068376 27 2951523620 28 6427133737 29 13014920506 30 28070588413 31 56212979470 32 120030667717