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A121097
as a simple table
n
a(n)
0
0
1
0
2
1
3
8
4
31
5
129
6
470
7
1720
8
6069
9
21339
[0,0,1,8,31,129,470,1720,6069,21339]
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Last modified August 24 21:46 EDT 2024. Contains 375417 sequences. (Running on oeis4.)