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A236694
as a simple table
n
a(n)
1
21
2
55
3
377
4
17711
5
121393
6
5702887
7
19740274219868223167
[21,55,377,17711,121393,5702887, 19740274219868223167]
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Last modified September 18 23:03 EDT 2024. Contains 376002 sequences. (Running on oeis4.)