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A238118
as a simple table
n
a(n)
1
1
2
6
3
20
4
101
5
327
6
1560
7
5333
8
24727
9
88422
10
403552
[1,6,20,101,327,1560,5333,24727,88422,403552]
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Last modified August 7 06:58 EDT 2024. Contains 375008 sequences. (Running on oeis4.)