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A302218
as a simple table
n
a(n)
1
0
2
3
3
43
4
934
5
40395
6
3420704
7
553097760
8
177191137344
9
102914156897887
10
122108799039662692
[0,3,43,934,40395,3420704,553097760,177191137344, 102914156897887,122108799039662692]