# A036783 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 7 4 27 5 118 6 539 7 2582 8 12736 9 64363 10 331239 11 1730575 12 9153221 13 48917102 14 263737228 15 1432790266 16 7835499474 17 43099916199 18 238299581172 19 1323627927733 20 7382441210007 21 41328639721641 22 232150252111223 23 1308049090247417