# A286981 (b-file synthesized from sequence entry) 1 56 2 84 3 120 4 126 5 252 6 792 7 816 8 88560 9 98280 10 116280 11 203490 12 695520 13 2035800 14 177100560 15 573166440 16 818809200 17 2310789600 18 8597496600 19 1889912732400