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A120560 as a simple table

na(n)
12
20
30
416
5-6
68
768
8-42
968
10208
11-160
12326
13502
14-420
151156
16994
17-670
183216
191720
20-8
217536
222704
235600
2412952
256786
2626060
2715640
2817196
2998906
30-24644
3183148
32270212
33-138436
34177012
35895512
36-784064
37835534
381842640
39-1419764

[2,0,0,16,-6,8,68,-42,68,208,-160,326,502,-420,
 1156,994,-670,3216,1720,-8,7536,2704,5600,12952,
 6786,26060,15640,17196,98906,-24644,83148,270212,
 -138436,177012,895512,-784064,835534,1842640,
 -1419764]