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A075216
as a simple table
n
a(n)
1
1
2
2
3
8
4
24
5
62
6
291
7
539
8
2625
9
6177
10
21923
11
37721
12
238267
13
299203
14
1338140
15
3492733
[1,2,8,24,62,291,539,2625,6177,21923,37721,238267, 299203,1338140,3492733]