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A375026 as a simple table

na(n)
01
1-3
26
3-9
412
5-18
630
7-45
860
9-90
10156
11-234
12288
13-432
14846
15-1269
161260
17-1890
184980
19-7470
203912
21-5868
2233996
23-50994
24-11688
2517532
26285720
27-428580
28-471480
29707220
302950830
31-4426245
32-7902900
3311854350
3435254980
35-52882470
36-115143480
37172715220
38457385220

[1,-3,6,-9,12,-18,30,-45,60,-90,156,-234,288,-432,
 846,-1269,1260,-1890,4980,-7470,3912,-5868,33996,
 -50994,-11688,17532,285720,-428580,-471480,707220,
 2950830,-4426245,-7902900,11854350,35254980,
 -52882470,-115143480,172715220,457385220]