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A221160 as a simple table

na(n)
01
15
256
3864
416896
5399360
611059200
7350945280
812551454720
9499415777280
1021879167385600
111046394961920000
1254245114825932800
133029690116944691200
14181363518724689100800
1511583863454028529664000
16786298610212845649920000
1756523637237014847291392000

[1,5,56,864,16896,399360,11059200,350945280,
 12551454720,499415777280,21879167385600,
 1046394961920000,54245114825932800,
 3029690116944691200,181363518724689100800,
 11583863454028529664000,786298610212845649920000,
 56523637237014847291392000]