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A167654
as a simple table
n
a(n)
0
0
1
0
2
0
3
0
4
42
5
294
6
1518
7
6942
8
29886
[0,0,0,0,42,294,1518,6942,29886]
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Last modified May 19 18:35 EDT 2022. Contains 353847 sequences. (Running on oeis4.)