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A302335
as a simple table
n
a(n)
1
0
2
1
3
4
4
26
5
164
6
1046
7
6672
8
42790
9
275888
10
1787624
11
11634704
[0,1,4,26,164,1046,6672,42790,275888,1787624, 11634704]