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A152959
as a simple table
n
a(n)
1
1
2
6
3
20
4
55
5
141
6
324
7
657
8
1329
9
2515
10
4592
11
7897
12
13221
[1,6,20,55,141,324,657,1329,2515,4592,7897,13221]