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A071109 as a simple table

na(n)
01
1-2
22
3-6
414
5-26
650
7-102
8214
9-426
10834
11-1678
123398
13-6778
1413482
15-27022
1654198
17-108306
18216346
19-432878
20866334
21-1732386
223463626
23-6927926
2413858350
25-27715378
2655426002
27-110855030
28221719582
29-443433610
30886848930
31-1773709078
323547455846

[1,-2,2,-6,14,-26,50,-102,214,-426,834,-1678,3398,
 -6778,13482,-27022,54198,-108306,216346,-432878,
 866334,-1732386,3463626,-6927926,13858350,
 -27715378,55426002,-110855030,221719582,
 -443433610,886848930,-1773709078,3547455846]