# A065412 (b-file synthesized from sequence entry) 0 0 1 0 2 0 3 0 4 1 5 20 6 480 7 10560 8 272640 9 8709120 10 280627200 11 10644480000 12 439404134400 13 18781972070400 14 873535419187200 15 45751167221760000 16 2665172872986624000 17 160281737951182848000 18 10593163661832880128000