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A061576
as a simple table
n
a(n)
-1
2
0
3
1
37
2
157
3
491
4
12613
5
78233
6
527377
7
3238481
8
381348997
9
1767218027
[2,3,37,157,491,12613,78233,527377,3238481, 381348997,1767218027]