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A254036
as a simple table
n
a(n)
0
1
1
1
2
1
3
3
4
9
5
33
6
128
7
564
8
2681
9
13845
10
76661
11
453025
12
2839968
13
18805590
[1,1,1,3,9,33,128,564,2681,13845,76661,453025, 2839968,18805590]
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Last modified May 12 11:29 EDT 2024. Contains 372475 sequences. (Running on oeis4.)