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A273680
as a simple table
n
a(n)
0
1
1
5
2
17
3
61
4
229
5
913
6
3537
7
13749
8
52929
9
207221
10
823365
11
3278237
12
13091905
13
52332353
14
209433741
15
837601361
[1,5,17,61,229,913,3537,13749,52929,207221,823365, 3278237,13091905,52332353,209433741,837601361]
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Last modified May 7 21:53 EDT 2024. Contains 372317 sequences. (Running on oeis4.)