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A036432
as a simple table
n
a(n)
0
1
1
2
2
7
3
38
4
122
5
2766
6
64686
7
1972296
8
5387768
9
56208248
10
753815160
11
130065181784
12
5398921735160
[1,2,7,38,122,2766,64686,1972296,5387768,56208248, 753815160,130065181784,5398921735160]