# A218551 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 13 5 37 6 106 7 322 8 987 9 3119 10 9985 11 32499 12 106910 13 355524 14 1191960 15 4026739 16 13689783 17 46807685 18 160842381 19 555175377 20 1923970425 21 6691769948 22 23351250882 23 81729943060 24 286842588316 25 1009256119760 26 3559337691300 27 12579738946685 28 44549347255523 29 158058591860684