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A245190
as a simple table
n
a(n)
0
1
1
3
2
336
3
80510976
4
4632013631072036192256
5
9259244309598002961669050091730162686136971834955923456
[1,3,336,80510976,4632013631072036192256, 92592443095980029616690500917301626861369718349559\ 23456]