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A375517 as a simple table

na(n)
12
22
34
412
5240
640200
71385211600
81469089808430082650
91705264091048404496800363077779646800
102355419752377504356995163180927294204575594409432081035253034399529376520

[2,2,4,12,240,40200,1385211600,
 1469089808430082650,
 1705264091048404496800363077779646800,
 23554197523775043569951631809272942045755944094320\
 81035253034399529376520]