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A278562 as a simple table

na(n)
00
11
2-1
31
4-5
519
6-6863
7751
8-3191
92857
10-467605
11434293
12-79370603
138181904909
14-564351550729
155044289
16-15949219262783
175026792806787
18-6536042124050878927
1969028763155644023
20-250300132038361463
211022779523247467
22-109243524012284271443941

[0,1,-1,1,-5,19,-6863,751,-3191,2857,-467605,
 434293,-79370603,8181904909,-564351550729,5044289,
 -15949219262783,5026792806787,
 -6536042124050878927,69028763155644023,
 -250300132038361463,1022779523247467,
 -109243524012284271443941]