# A088717 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 14 4 84 5 596 6 4785 7 42349 8 406287 9 4176971 10 45640572 11 526788153 12 6392402793 13 81247489335 14 1078331283648 15 14907041720241 16 214187010762831 17 3192620516380376 18 49287883925072010 19 786925082232918304 20 12976244331714379149 21 220728563512663520510