a(0) = a(1) = 0; thereafter a(n) = 2*a(n-1)*a(n-2) + 1.
A143684
a(0) = a(1) = 0; thereafter a(n) = 2*a(n-1)*a(n-2) + 1.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =1a(4) =3a(5) =7a(6) =43a(7) =603a(8) =51859a(9) =62541955
External references
- oeis: A143684
A143684
a(0) = a(1) = 0; thereafter a(n) = 2*a(n-1)*a(n-2) + 1.