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A084965
as a simple table
n
a(n)
0
1
1
1
2
6
3
44
4
386
5
3852
6
42640
7
516791
8
6817378
9
98091071
10
1569786228
[1,1,6,44,386,3852,42640,516791,6817378,98091071, 1569786228]