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A077985 as a simple table

na(n)
01
1-2
25
3-12
429
5-70
6169
7-408
8985
9-2378
105741
11-13860
1233461
13-80782
14195025
15-470832
161136689
17-2744210
186625109
19-15994428
2038613965
21-93222358
22225058681
23-543339720
241311738121
25-3166815962
267645370045
27-18457556052
2844560482149
29-107578520350
30259717522849

[1,-2,5,-12,29,-70,169,-408,985,-2378,5741,-13860,
 33461,-80782,195025,-470832,1136689,-2744210,
 6625109,-15994428,38613965,-93222358,225058681,
 -543339720,1311738121,-3166815962,7645370045,
 -18457556052,44560482149,-107578520350,
 259717522849]