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A261006
as a simple table
n
a(n)
0
1
1
1
2
1
3
3
4
14
5
157
6
15942
7
489980450
8
1392195547909966848
9
789204635842035012967539870068113408
[1,1,1,3,14,157,15942,489980450, 1392195547909966848, 789204635842035012967539870068113408]