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A282018 as a simple table

na(n)
01
1-72
21512
3-3744
4-95544
5-473904
6-1538784
7-3947328
8-8597880
9-16987176
10-30607632
11-52030944
12-83972448
13-129500784
14-194056128
15-279446976
16-397468152
17-544155408
18-743106744
19-978896160
20-1296984528
21-1654458624
22-2139055776
23-2661349824
24-3370243680
25-4106376504
26-5113466064

[1,-72,1512,-3744,-95544,-473904,-1538784,
 -3947328,-8597880,-16987176,-30607632,-52030944,
 -83972448,-129500784,-194056128,-279446976,
 -397468152,-544155408,-743106744,-978896160,
 -1296984528,-1654458624,-2139055776,-2661349824,
 -3370243680,-4106376504,-5113466064]