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A294066 as a simple table

na(n)
02
1-4
28
3-12
420
5-44
652
7-76
8136
9-164
10252
11-396
12482
13-684
14990
15-1272
161748
17-2388
183038
19-4020
205358
21-6796
228820
23-11448
2414334
25-18304
2623320
27-28940
2836444
29-45708
3056340
31-70056
3286698
33-106056
34130400
35-159852
36194166
37-236452
38287272
39-346544
40418746
41-504800
42604946
43-725756
44868892
45-1035456
461234410
47-1468436
481740602
49-2063076
502440838
51-2879056
523394228
53-3995400
544690976

[2,-4,8,-12,20,-44,52,-76,136,-164,252,-396,482,
 -684,990,-1272,1748,-2388,3038,-4020,5358,-6796,
 8820,-11448,14334,-18304,23320,-28940,36444,
 -45708,56340,-70056,86698,-106056,130400,-159852,
 194166,-236452,287272,-346544,418746,-504800,
 604946,-725756,868892,-1035456,1234410,-1468436,
 1740602,-2063076,2440838,-2879056,3394228,
 -3995400,4690976]