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A127725
as a simple table
n
a(n)
1
2
2
12
3
40
4
252
5
880
6
10880
7
75852
8
715816960
9
62549517598720
[2,12,40,252,880,10880,75852,715816960, 62549517598720]
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Last modified April 23 16:28 EDT 2024. Contains 371916 sequences. (Running on oeis4.)