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A235326
as a simple table
n
a(n)
0
1
1
1
2
4
3
51
4
1504
5
66525
6
4196856
7
359031967
8
39705044464
9
5476674540825
[1,1,4,51,1504,66525,4196856,359031967, 39705044464,5476674540825]