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A198311
as a simple table
n
a(n)
1
12
2
70
3
98
4
448
5
1170
6
2340
7
11700
8
84630
9
94668
10
428736
11
662676
12
1325352
[12,70,98,448,1170,2340,11700,84630,94668,428736, 662676,1325352]