Somos-4 variant: if n!=4k+1, then a(n) = (4*a(n-1)*a(n-3) - 4*a(n-2)^2) / a(n-4), otherwise a(n) = 0, with a(-2) = a(-1) = a(0) = 1.
A162547
Somos-4 variant: if n!=4k+1, then a(n) = (4*a(n-1)*a(n-3) - 4*a(n-2)^2) / a(n-4), otherwise a(n) = 0, with a(-2) = a(-1) = a(0) = 1.
Terms
- a(0) =1a(1) =0a(2) =-4a(3) =-16a(4) =-64a(5) =0a(6) =4096a(7) =65536a(8) =1048576a(9) =0a(10) =-1073741824a(11) =-68719476736a(13) =0a(17) =0a(21) =0
External references
- oeis: A162547