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A215606
as a simple table
n
a(n)
1
4
2
140
3
8472
4
157056
5
1629912
6
7050672
7
13962864
8
11951592
9
4526544
10
606408
11
23136
[4,140,8472,157056,1629912,7050672,13962864, 11951592,4526544,606408,23136]