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A369348
as a simple table
n
a(n)
1
1
2
6
3
20
4
40
5
106
6
326
7
568
8
1294
9
2071
10
2323
11
2603
12
2867
13
4467
[1,6,20,40,106,326,568,1294,2071,2323,2603,2867, 4467]