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A203418 as a simple table

na(n)
11
22
316
4240
511520
613271040
7254803968000
815892123484160000
95126163351050649600000
1089288743527804466888704000000
1150689719717698351557731837542400000000
12125765178831579421305165126665125232640000000000

[1,2,16,240,11520,13271040,254803968000,
 15892123484160000,5126163351050649600000,
 89288743527804466888704000000,
 50689719717698351557731837542400000000,
 125765178831579421305165126665125232640000000000]