# A149465 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 13 4 53 5 201 6 840 7 3574 8 15657 9 68851 10 307490 11 1388692 12 6344965 13 29161051 14 134782622 15 626411797 16 2927546988 17 13742107029 18 64735935244 19 305917618200 20 1450175440663 21 6894191053917 22 32856878608281 23 156932879198304 24 751070728564779 25 3601468236987239 26 17299977132250675 27 83234577482537502