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A212770 as a simple table

na(n)
11
2-2
31
4-4
510
6-10
712
8-24
937
10-44
1156
12-84
13126
14-160
15186
16-272
17394
18-466
19568
20-792
211052
22-1272
231560
24-2040
252663
26-3244
273877
28-4992
296410
30-7644
319180
32-11616
3314472
34-17284
3520712
36-25572
3731518
38-37576
3944510
40-54416
4166402
42-78368
4392648

[1,-2,1,-4,10,-10,12,-24,37,-44,56,-84,126,-160,
 186,-272,394,-466,568,-792,1052,-1272,1560,-2040,
 2663,-3244,3877,-4992,6410,-7644,9180,-11616,
 14472,-17284,20712,-25572,31518,-37576,44510,
 -54416,66402,-78368,92648]