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A298576
as a simple table
n
a(n)
1
0
2
3
3
15
4
78
5
765
6
16521
7
708805
8
40964223
9
4776371282
10
1079598223972
[0,3,15,78,765,16521,708805,40964223,4776371282, 1079598223972]