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A271946 as a simple table

na(n)
01
1720
2344881152000
32208058019165981638656000000
41369986068925795885347091500568179543900160000000000
5363392722685428853076589064611759104109572860599125858715484081356800000000000000000

[1,720,344881152000,2208058019165981638656000000,
 13699860689257958853470915005681795439001600000000\
 00,
 36339272268542885307658906461175910410957286059912\
 5858715484081356800000000000000000]