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A267626
as a simple table
n
a(n)
1
1
2
10
3
39
4
208
5
1576
6
14830
7
168500
8
2247280
9
34423760
10
596248800
11
11529957600
12
246360114000
[1,10,39,208,1576,14830,168500,2247280,34423760, 596248800,11529957600,246360114000]