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A197721
as a simple table
n
a(n)
1
1
2
7
3
25
4
409
5
14185
6
1029761
7
168151040
8
60063611063
9
47206720536227
10
81729461999719503
[1,7,25,409,14185,1029761,168151040,60063611063, 47206720536227,81729461999719503]