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A192725
as a simple table
n
a(n)
1
0
2
0
3
2
4
321
5
44235
6
13598914
7
10891389277
8
23632256605485
9
139999109890707779
10
2266762580564216930099
[0,0,2,321,44235,13598914,10891389277, 23632256605485,139999109890707779, 2266762580564216930099]