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A273503
as a simple table
n
a(n)
0
1
1
5
2
17
3
61
4
221
5
793
6
2761
7
11153
8
43561
9
174765
10
695393
11
2770901
12
11045381
13
44187869
14
176521361
15
706067621
[1,5,17,61,221,793,2761,11153,43561,174765,695393, 2770901,11045381,44187869,176521361,706067621]
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Last modified May 9 05:44 EDT 2024. Contains 372344 sequences. (Running on oeis4.)