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A078038 as a simple table

na(n)
01
1-2
24
3-7
413
5-23
642
7-75
8136
9-244
10441
11-793
121431
13-2576
144645
15-8366
1615080
17-27167
1848961
19-88215
20158970
21-286439
22516164
23-930072
241675961
25-3019941
265441791
27-9805712
2817669353
29-31838986
3057371980
31-103380599
32186285573
33-335674791
34604865338
35-1089929347
361963985232

[1,-2,4,-7,13,-23,42,-75,136,-244,441,-793,1431,
 -2576,4645,-8366,15080,-27167,48961,-88215,158970,
 -286439,516164,-930072,1675961,-3019941,5441791,
 -9805712,17669353,-31838986,57371980,-103380599,
 186285573,-335674791,604865338,-1089929347,
 1963985232]