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A232154
as a simple table
n
a(n)
1
1
2
18
3
290
4
7770
5
382996
6
36275078
7
6564512068
8
2246994465516
9
1482101422338982
10
1881388287368571956
[1,18,290,7770,382996,36275078,6564512068, 2246994465516,1482101422338982, 1881388287368571956]