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A112261 as a simple table

na(n)
1-2
20
312
420
5-12
6-60
752
8420
9468
10-700
11-1548
123300
1313588
148580
15-29388
16-30940
17152148
18406980
1960532
20-1043100
21-236652
226032900
2311173812
24-4569180
25-32487212
2619343940
27216401652
28273243620
29-323927532
30-880031100
311489420852
327157028900

[-2,0,12,20,-12,-60,52,420,468,-700,-1548,3300,
 13588,8580,-29388,-30940,152148,406980,60532,
 -1043100,-236652,6032900,11173812,-4569180,
 -32487212,19343940,216401652,273243620,-323927532,
 -880031100,1489420852,7157028900]