a(n) = ((-4)^((p-1)/4) - 1)/p, where p is the n-th prime congruent to 1 mod 4.
A318898
a(n) = ((-4)^((p-1)/4) - 1)/p, where p is the n-th prime congruent to 1 mod 4.
Terms
- a(0) =-1a(1) =-5a(2) =15a(3) =-565a(4) =-7085a(5) =25575a(6) =-1266205a(7) =-17602325a(8) =941362695a(9) =197665011735
External references
- oeis: A318898