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A316577
as a simple table
n
a(n)
1
0
2
7
3
63
4
2477
5
130212
6
15492767
7
4227286531
8
2151886485463
9
2515639556772307
[0,7,63,2477,130212,15492767,4227286531, 2151886485463,2515639556772307]