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A306810 as a simple table

na(n)
02
1-1
22
3-4
47
5-8
6-2
741
8-134
9296
10-485
11512
1282
13-2107
146562
15-13852
1621871
17-22600
18-2186
1983105
20-255878
21531440
22-826685
23846368
2459050
25-2952451
269034498
27-18600436
2828697815
29-29229256
30-1594322
3198848025
32-301327046
33617003000
34-947027861
35961376768
3643046722

[2,-1,2,-4,7,-8,-2,41,-134,296,-485,512,82,-2107,
 6562,-13852,21871,-22600,-2186,83105,-255878,
 531440,-826685,846368,59050,-2952451,9034498,
 -18600436,28697815,-29229256,-1594322,98848025,
 -301327046,617003000,-947027861,961376768,
 43046722]