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A138503 as a simple table

na(n)
11
2-7
328
4-71
5126
6-196
7344
8-583
9757
10-882
111332
12-1988
132198
14-2408
153528
16-4679
174914
18-5299
196860
20-8946
219632
22-9324
2312168
24-16324
2515751
26-15386
2720440
28-24424
2924390
30-24696
3129792
32-37447
3337296
34-34398
3543344
36-53747
3750654
38-48020
3961544
40-73458

[1,-7,28,-71,126,-196,344,-583,757,-882,1332,
 -1988,2198,-2408,3528,-4679,4914,-5299,6860,-8946,
 9632,-9324,12168,-16324,15751,-15386,20440,-24424,
 24390,-24696,29792,-37447,37296,-34398,43344,
 -53747,50654,-48020,61544,-73458]