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A302183
as a simple table
n
a(n)
0
1
1
1
2
4
3
10
4
39
5
131
6
521
7
1989
8
8149
9
33205
10
139870
11
592120
12
2552155
[1,1,4,10,39,131,521,1989,8149,33205,139870, 592120,2552155]