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A077916 as a simple table

na(n)
01
1-1
25
3-10
430
5-74
6199
7-515
81355
9-3540
109276
11-24276
1263565
13-166405
14435665
15-1140574
162986074
17-7817630
1820466835
19-53582855
20140281751
21-367262376
22961505400
23-2517253800
246590256025
25-17253514249
2645170286749
27-118257345970
28309601751190
29-810547907570

[1,-1,5,-10,30,-74,199,-515,1355,-3540,9276,
 -24276,63565,-166405,435665,-1140574,2986074,
 -7817630,20466835,-53582855,140281751,-367262376,
 961505400,-2517253800,6590256025,-17253514249,
 45170286749,-118257345970,309601751190,
 -810547907570]