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A009277 as a simple table

na(n)
01
12
2-4
3-88
44496
5-155488
6675776
7903834752
8-178181918464
926154843525632
10-2632795710260224
11-207121926659381248
12274561534481040183296
13-132684091405061956722688
1450873850498309673207709696

[1,2,-4,-88,4496,-155488,675776,903834752,
 -178181918464,26154843525632,-2632795710260224,
 -207121926659381248,274561534481040183296,
 -132684091405061956722688,
 50873850498309673207709696]