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A286346 as a simple table

na(n)
01
1-24
2264
3-1760
47944
5-25872
664416
7-133056
8253704
9-472760
10825264
11-1297056
121938336
13-2963664
144437312
15-6091584
168118024
17-11368368
1815653352
19-19822176
2024832944
21-32826112
2242517728
23-51425088
2461903776
25-78146664
2698021616
27-115331264
28133522752

[1,-24,264,-1760,7944,-25872,64416,-133056,253704,
 -472760,825264,-1297056,1938336,-2963664,4437312,
 -6091584,8118024,-11368368,15653352,-19822176,
 24832944,-32826112,42517728,-51425088,61903776,
 -78146664,98021616,-115331264,133522752]