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A166176
as a simple table
n
a(n)
0
1
1
5
2
35
3
232
4
6052
5
285850
6
20417349
7
3439249710
8
1105607996796
9
654788462119153
10
783760670032822151
[1,5,35,232,6052,285850,20417349,3439249710, 1105607996796,654788462119153,783760670032822151]