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A078905 as a simple table

na(n)
11
2-5
315
4-30
540
6-26
7-30
8125
9-220
10245
11-124
12-180
13615
14-1010
151085
16-550
17-705
182415
19-3850
203980
21-1926
22-2460
238090
24-12550
2512715
26-6074
27-7500
2824360
29-37150
3036930
31-17251
32-21155
3367380
34-101210
3599295
36-45924
37-55305
38174500
39-259140
40251275
41-114750

[1,-5,15,-30,40,-26,-30,125,-220,245,-124,-180,
 615,-1010,1085,-550,-705,2415,-3850,3980,-1926,
 -2460,8090,-12550,12715,-6074,-7500,24360,-37150,
 36930,-17251,-21155,67380,-101210,99295,-45924,
 -55305,174500,-259140,251275,-114750]