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A270456 as a simple table

na(n)
04
14
224
3-8
460
5-36
6112
7-80
8180
9-140
10264
11-216
12364
13-308
14480
15-416
16612
17-540
18760
19-680
20924
21-836
221104
23-1008
241300
25-1196
261512
27-1400
281740
29-1620
301984
31-1856
322244
33-2108
342520
35-2376
362812
37-2660
383120
39-2960
403444
41-3276
423784
43-3608
444140

[4,4,24,-8,60,-36,112,-80,180,-140,264,-216,364,
 -308,480,-416,612,-540,760,-680,924,-836,1104,
 -1008,1300,-1196,1512,-1400,1740,-1620,1984,-1856,
 2244,-2108,2520,-2376,2812,-2660,3120,-2960,3444,
 -3276,3784,-3608,4140]