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A255487
as a simple table
n
a(n)
0
1
1
1
2
1
3
2
4
7
5
27
6
164
7
1316
8
12757
9
134174
10
1474341
11
16588434
[1,1,1,2,7,27,164,1316,12757,134174,1474341, 16588434]