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A190827
as a simple table
n
a(n)
1
0
2
0
3
1
4
109
5
12721
6
2001240
7
418539642
8
113320421342
9
38733396860601
10
16350175635962731
[0,0,1,109,12721,2001240,418539642,113320421342, 38733396860601,16350175635962731]