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A278562 as a simple table

n a(n)
0 0
1 1
2 -1
3 1
4 -5
5 19
6 -6863
7 751
8 -3191
9 2857
10 -467605
11 434293
12 -79370603
13 8181904909
14 -564351550729
15 5044289
16 -15949219262783
17 5026792806787
18 -6536042124050878927
19 69028763155644023
20 -250300132038361463
21 1022779523247467
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]

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Last modified June 24 01:07 EDT 2021. Contains 345404 sequences. (Running on oeis4.)