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A174251
as a simple table
n
a(n)
0
1
1
1
2
7
3
259
4
9525
5
270827
6
6633399
7
158753814
8
3825111851
9
96608374284
10
2446223788303
[1,1,7,259,9525,270827,6633399,158753814, 3825111851,96608374284,2446223788303]