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A089871 as a simple table

n a(n)
0 1
1 1
2 2
3 2
4 2
5 10
6 40
7 240
8 5040
9 388080
10 5045040
11 94643905622666400 

[1,1,2,2,2,10,40,240,5040,388080,5045040,
 94643905622666400]

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Last modified September 1 03:07 EDT 2024. Contains 375575 sequences. (Running on oeis4.)