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A266876
as a simple table
n
a(n)
1
1
2
0
3
1
4
7
5
351
6
19773
7
1567330
8
166758092
9
22928383502
10
3956915450846
11
837459080604863
[1,0,1,7,351,19773,1567330,166758092,22928383502, 3956915450846,837459080604863]