# A054199 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 8 4 17 5 39 6 95 7 240 8 619 9 1615 10 4241 11 11184 12 29601 13 78645 14 209830 15 562454 16 1515325 17 4104547 18 11180365 19 30627574 20 84375837 21 233729358 22 650888094 23 1821718080 24 5122765105 25 14468782826 26 41031251163 27 116789504201 28 333544999893 29 955496210873 30 2744724190487