# A375226 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 30 4 240 5 2520 6 30600 7 413280 8 6168960 9 101666880 10 1842825600 11 36483955200 12 782548905600 13 18048500870400 14 444816333561600 15 11656620213638400 16 323500679915212800 17 9475966585948262400 18 292101319958063616000 19 9450373008137757696000