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A297859
as a simple table
n
a(n)
1
0
2
1
3
4
4
15
5
2621
6
284344
7
76517448
8
58344517697
9
99045666327382
10
434103508383656941
[0,1,4,15,2621,284344,76517448,58344517697, 99045666327382,434103508383656941]