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A282019 as a simple table

na(n)
01
1216
2-3672
3-62496
4-322488
5-1121904
6-2969568
7-6737472
8-13678200
9-24978312
10-43826832
11-70620768
12-112325472
13-166558896
14-248342976
15-346320576
16-491604984
17-655461072
18-897864696
19-1154109600
20-1532856528
21-1921344768
22-2488726944
23-3042415296
24-3876616800
25-4639932504

[1,216,-3672,-62496,-322488,-1121904,-2969568,
 -6737472,-13678200,-24978312,-43826832,-70620768,
 -112325472,-166558896,-248342976,-346320576,
 -491604984,-655461072,-897864696,-1154109600,
 -1532856528,-1921344768,-2488726944,-3042415296,
 -3876616800,-4639932504]