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A189839 as a simple table

n a(n)
1 1
2 2
3 6
4 20
5 80
6 384
7 2112
8 12992
9 94272
10 716800
11 6141440
12 58451568
13 596647568
14 6555879072
15 77766001056
16 981202169600 

[1,2,6,20,80,384,2112,12992,94272,716800,6141440,
 58451568,596647568,6555879072,77766001056,
 981202169600]

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Last modified April 19 17:38 EDT 2024. Contains 371797 sequences. (Running on oeis4.)