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A176840
as a simple table
n
a(n)
0
1
1
-1
2
1
3
-1
4
1
5
-1
6
5
7
-691
8
7
9
-3617
10
43867
11
-174611
12
854513
[1,-1,1,-1,1,-1,5,-691,7,-3617,43867,-174611, 854513]