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A139669
as a simple table
n
a(n)
0
1
1
2
2
4
3
12
4
42
5
195
6
1387
7
19324
8
1083472
[1,2,4,12,42,195,1387,19324,1083472]
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Last modified April 24 09:41 EDT 2024. Contains 371935 sequences. (Running on oeis4.)
