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A276474 as a simple table

na(n)
01
11
2-1
3-5
415
587
6-609
7-8337
8125055
92695455
10-83559105
11-4212669825
12265398198975
1322347926076735
14-2838186611745345
15-560679228377509185
16142973203236264842175
1747858338570309251530175
18-24455611009428027531919425
19-19225279650279123532147010625

[1,1,-1,-5,15,87,-609,-8337,125055,2695455,
 -83559105,-4212669825,265398198975,22347926076735,
 -2838186611745345,-560679228377509185,
 142973203236264842175,47858338570309251530175,
 -24455611009428027531919425,
 -19225279650279123532147010625]