# A159308 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 14 5 40 6 154 7 631 8 2246 9 10476 10 71232 11 383220 12 1553841 13 8223567 14 58756725 15 338290401 16 1754330940 17 11744499990 18 103864469131 19 1220564280222 20 17394859369497 21 214311637862464 22 1891506713163679 23 10894997683415647