# A370699 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 20 5 100 6 610 7 4270 8 34160 9 307160 10 3071600 11 33787600 12 405466600 13 5271065800 14 73794921200 15 1106922416600 16 17710758665600 17 301082897315200 18 5419492342264000 19 102970354503016000 20 2059407090060320000 21 43247548855054544000 22 951446074811199968000