# A048757 (b-file synthesized from sequence entry) 0 1 1 4 2 9 3 33 4 56 5 203 6 441 7 1596 8 2585 9 9353 10 20304 11 73461 12 124033 13 448756 14 974169 15 3524577 16 5702888 17 20633243 18 44791065 19 162055596 20 273617239 21 989956471 22 2149017696 23 7775219067 24 12591974497 25 45558191716 26 98898651657