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A316734
as a simple table
n
a(n)
1
0
2
7
3
23
4
95
5
4956
6
144106
7
1906293
8
1342645923
9
632741511767
10
215792317298469
[0,7,23,95,4956,144106,1906293,1342645923, 632741511767,215792317298469]