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A003198
as a simple table
n
a(n)
0
1
1
6
2
18
3
48
4
126
5
300
6
762
7
1668
8
4216
9
8668
10
21988
11
43058
12
110832
13
202432
14
561020
[1,6,18,48,126,300,762,1668,4216,8668,21988,43058, 110832,202432,561020]