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A271514 as a simple table

na(n)
10
20
312
41440
5207360
646448640
717836277760
812328435187712
915780397040271360
1038089369770346414080
11175515815901756276080640
121557644360856119698123653120
1326796467468679998390760829353984

[0,0,12,1440,207360,46448640,17836277760,
 12328435187712,15780397040271360,
 38089369770346414080,175515815901756276080640,
 1557644360856119698123653120,
 26796467468679998390760829353984]