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A279780 as a simple table

na(n)
01
1-3
25
3-9
417
5-30
652
7-90
8154
9-262
10446
11-758
121286
13-2182
143702
15-6278
1610646
17-18054
1830614
19-51910
2088022
21-149254
22253078
23-429126
24727638
25-1233798
262092054
27-3547334
286014934
29-10199046
3017293718
31-29323590
3249721686
33-84309126
34142956310

[1,-3,5,-9,17,-30,52,-90,154,-262,446,-758,1286,
 -2182,3702,-6278,10646,-18054,30614,-51910,88022,
 -149254,253078,-429126,727638,-1233798,2092054,
 -3547334,6014934,-10199046,17293718,-29323590,
 49721686,-84309126,142956310]