# A149050 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 10 4 39 5 149 6 621 7 2608 8 11362 9 50005 10 224087 11 1013844 12 4634939 13 21348758 14 99021584 15 461872495 16 2165291885 17 10194743118 18 48184538956 19 228506836782 20 1086931778012 21 5184096470608 22 24785574274311 23 118761815637600 24 570191410379617 25 2742543994332775 26 13213240012589938 27 63757133657178463