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A027851
as a simple table
n
a(n)
0
1
1
1
2
5
3
24
4
188
5
1915
6
28634
7
1627672
8
3684030417
9
105978177936292
[1,1,5,24,188,1915,28634,1627672,3684030417, 105978177936292]
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Last modified May 11 06:34 EDT 2024. Contains 372388 sequences. (Running on oeis4.)