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A330211
as a simple table
n
a(n)
0
1
1
1
2
1
3
2
4
8
5
28
6
143
7
747
8
4346
9
25974
10
160869
11
1015723
12
6531611
13
42592880
[1,1,1,2,8,28,143,747,4346,25974,160869,1015723, 6531611,42592880]