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A047810
as a simple table
n
a(n)
0
0
1
4
2
20
3
56
4
120
5
220
6
364
7
560
8
816
9
1140
10
1540
11
2024
12
2600
13
3276
14
4060
15
4960
16
5984
[0,4,20,56,120,220,364,560,816,1140,1540,2024, 2600,3276,4060,4960,5984]