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A280033 as a simple table

na(n)
11
2-2
310
4-2
516
6-184
7456
8-184
916
10-272
115776
12-30736
1355504
14-30736
155776
16-272
177936
18-284288
192555008
20-8998016
2113801600
22-8998016
232555008
24-284288
257936
26-353792
2720594432
28-280444416
291567885056
30-4267790592
315960135424
32-4267790592
331567885056
34-280444416
3520594432
36-353792

[1,-2,10,-2,16,-184,456,-184,16,-272,5776,-30736,
 55504,-30736,5776,-272,7936,-284288,2555008,
 -8998016,13801600,-8998016,2555008,-284288,7936,
 -353792,20594432,-280444416,1567885056,
 -4267790592,5960135424,-4267790592,1567885056,
 -280444416,20594432,-353792]