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A227005
as a simple table
n
a(n)
1
0
2
1
3
4
4
20
5
346
6
6891
7
634172
8
47917598
9
27622729933
10
6998287399637
[0,1,4,20,346,6891,634172,47917598,27622729933, 6998287399637]