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A280434
as a simple table
n
a(n)
1
0
2
4
3
21
4
80
5
225
6
548
7
1211
8
2512
9
4989
10
9604
11
18073
12
33432
13
61035
14
110276
15
197581
16
351568
17
621945
[0,4,21,80,225,548,1211,2512,4989,9604,18073, 33432,61035,110276,197581,351568,621945]