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A216857 as a simple table

na(n)
00
11
24
324
4224
52880
647232
7942592
822171648
9600698880
1018422374400
11630897721344
1223864653578240
13988197253808128
1444460603225407488
152159714024218951680
16112652924603290615808
176280048587936003784704
18372616014329572403183616
1923445082059018189741752320
201559275240299007139066675200

[0,1,4,24,224,2880,47232,942592,22171648,
 600698880,18422374400,630897721344,23864653578240,
 988197253808128,44460603225407488,
 2159714024218951680,112652924603290615808,
 6280048587936003784704,372616014329572403183616,
 23445082059018189741752320,
 1559275240299007139066675200]