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A303343 as a simple table

na(n)
01
1-2
2-2
3-12
4-90
5-968
6-12764
7-200464
8-3674378
9-76958942
10-1814783184
11-47618072204
12-1376556963244
13-43481881639608
14-1490306874257184
15-55091497907730000
16-2185104061817592618
17-92567886910879671396
18-4171638481112174023226

[1,-2,-2,-12,-90,-968,-12764,-200464,-3674378,
 -76958942,-1814783184,-47618072204,-1376556963244,
 -43481881639608,-1490306874257184,
 -55091497907730000,-2185104061817592618,
 -92567886910879671396,-4171638481112174023226]