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A172863 as a simple table

n a(n)
1 0
2 0
3 1
4 40176
5 22989265901
6 83308687622580480
7 1590632917730889408984804
8 138992936515606925094500549847168
9 49028617232539794829106747972829351457296 

[0,0,1,40176,22989265901,83308687622580480,
 1590632917730889408984804,
 138992936515606925094500549847168,
 49028617232539794829106747972829351457296]

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Last modified April 24 18:17 EDT 2024. Contains 371962 sequences. (Running on oeis4.)