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A097679 as a simple table

na(n)
01
14
216
364
4280
51600
612160
7102400
8880000
98358400
1094720000
111189888000
1215213952000
13204285952000
143092697088000
1551351519232000
16869951500288000
1715148619579392000
18287722152460288000
195927812334878720000

[1,4,16,64,280,1600,12160,102400,880000,8358400,
 94720000,1189888000,15213952000,204285952000,
 3092697088000,51351519232000,869951500288000,
 15148619579392000,287722152460288000,
 5927812334878720000]