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A172669 as a simple table

n a(n)
1 0
2 20
3 1376095
4 1252634243520
5 8432855707512236000
6 297155971199028097720850000
7 42758542523186088601256526892620000
8 20877662827076969301744211245461828236480000 

[0,20,1376095,1252634243520,8432855707512236000,
 297155971199028097720850000,
 42758542523186088601256526892620000,
 20877662827076969301744211245461828236480000]

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Last modified April 25 10:34 EDT 2024. Contains 371967 sequences. (Running on oeis4.)