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A007688
as a simple table
n
a(n)
1
4
2
16
3
52
4
144
5
420
6
816
7
1732
8
3508
9
7060
10
18640
[4,16,52,144,420,816,1732,3508,7060,18640]
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Last modified April 17 23:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)
