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A172669 as a simple table

na(n)
10
220
31376095
41252634243520
58432855707512236000
6297155971199028097720850000
742758542523186088601256526892620000
820877662827076969301744211245461828236480000

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