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A187745
as a simple table
n
a(n)
0
1
1
1
2
1
3
-1
4
-1
5
-3617
6
-7709321041217
7
-106783830147866529886385444979142647942017
[1,1,1,-1,-1,-3617,-7709321041217, -106783830147866529886385444979142647942017]