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A097949 as a simple table

na(n)
0-2
11
2-4
39
4-34
5121
6-452
71681
8-6274
923409
10-87364
11326041
12-1216802
134541161
14-16947844
1563250209
16-236052994
17880961761
18-3287794052
1912270214441
20-45793063714
21170902040409
22-637815097924
232380358351281
24-8883618307202
2533154114877521
26-123732841202884

[-2,1,-4,9,-34,121,-452,1681,-6274,23409,-87364,
 326041,-1216802,4541161,-16947844,63250209,
 -236052994,880961761,-3287794052,12270214441,
 -45793063714,170902040409,-637815097924,
 2380358351281,-8883618307202,33154114877521,
 -123732841202884]