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A003489
as a simple table
n
a(n)
1
4
2
20
3
84
4
292
5
980
6
3052
7
9316
8
27396
9
79412
[4,20,84,292,980,3052,9316,27396,79412]
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Last modified April 20 12:25 EDT 2024. Contains 371844 sequences. (Running on oeis4.)
