# A149523 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 11 4 51 5 159 6 715 7 2481 8 11325 9 41821 10 192007 11 737257 12 3411795 13 13471713 14 62670875 15 252326759 16 1179837765 17 4828186997 18 22652634461 19 93834192877 20 441735525933 21 1849484581727 22 8727042047851 23 36848287161913 24 174283333955443 25 741510358902935 26 3513143608766455 27 15040368579197489