# A148416 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 17 5 61 6 234 7 935 8 3834 9 16099 10 68800 11 298743 12 1314381 13 5847047 14 26259408 15 118899489 16 542185061 17 2487712901 18 11476655590 19 53200947263 20 247676625637 21 1157496494273 22 5428210480192 23 25536009034995 24 120471803123458 25 569830600657011 26 2701712842966650 27 12837554523138593 28 61122512592654635