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A221786
as a simple table
n
a(n)
1
0
2
55
3
840
4
15936
5
252538
6
4781652
7
76353254
8
1402260000
9
23429257696
[0,55,840,15936,252538,4781652,76353254, 1402260000,23429257696]
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Last modified September 25 23:09 EDT 2023. Contains 365649 sequences. (Running on oeis4.)
