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A270728 as a simple table

na(n)
04
10
228
3-20
480
5-60
6144
7-148
8272
9-248
10384
11-364
12520
13-436
14620
15-648
16896
17-860
181124
19-1080
201392
21-1392
221664
23-1596
241944
25-1880
262196
27-2108
282468
29-2284
302596
31-2560
323044
33-2952
343476
35-3396
364004
37-4076
384616
39-4564
405192
41-5220
425844
43-5812

[4,0,28,-20,80,-60,144,-148,272,-248,384,-364,520,
 -436,620,-648,896,-860,1124,-1080,1392,-1392,1664,
 -1596,1944,-1880,2196,-2108,2468,-2284,2596,-2560,
 3044,-2952,3476,-3396,4004,-4076,4616,-4564,5192,
 -5220,5844,-5812]