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A138521 as a simple table

na(n)
01
1-5
210
3-15
430
5-55
680
7-120
8190
9-285
10410
11-585
12840
13-1190
141640
15-2240
163070
17-4170
185570
19-7400
209830
21-12960
2216920
23-21990
2428520
25-36805
2647180
27-60225
2876720
29-97350
30122880
31-154610
32194110
33-242880
34302740
35-376295
36466710
37-577270
38711800

[1,-5,10,-15,30,-55,80,-120,190,-285,410,-585,840,
 -1190,1640,-2240,3070,-4170,5570,-7400,9830,
 -12960,16920,-21990,28520,-36805,47180,-60225,
 76720,-97350,122880,-154610,194110,-242880,302740,
 -376295,466710,-577270,711800]