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A359691
as a simple table
n
a(n)
1
1
2
7
3
59
4
275
5
1949
6
3971
7
20333
8
45705
9
120899
10
205233
11
629761
12
897707
13
2334291
14
3461329
15
5516985
16
8467899
[1,7,59,275,1949,3971,20333,45705,120899,205233, 629761,897707,2334291,3461329,5516985,8467899]