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A129834
as a simple table
n
a(n)
1
0
2
0
3
1
4
3
5
9
6
23
7
171
8
475
9
1307
10
10245
11
28951
12
233099
13
664496
14
5442024
15
3109434694
16
218785948496
[0,0,1,3,9,23,171,475,1307,10245,28951,233099, 664496,5442024,3109434694,218785948496]
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Last modified September 4 15:15 EDT 2024. Contains 375683 sequences. (Running on oeis4.)