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A322519 as a simple table

na(n)
01
14
264
31240
427640
5667744
617013976
7450174736
812250723480
9340711148320
109641274232384
11276704848753216
128035189363318936
13235655550312118720
146970100090159566480
15207674717284507191520
166227433643414033714840
17187795334412416019255520

[1,4,64,1240,27640,667744,17013976,450174736,
 12250723480,340711148320,9641274232384,
 276704848753216,8035189363318936,
 235655550312118720,6970100090159566480,
 207674717284507191520,6227433643414033714840,
 187795334412416019255520]