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A143249
as a simple table
n
a(n)
1
0
2
2
3
10
4
290
5
17394
6
2218778
7
473405802
8
163347720914
9
83473085624962
10
61000324824203498
[0,2,10,290,17394,2218778,473405802,163347720914, 83473085624962,61000324824203498]