Continued cotangent recurrence a(n+1)=a(n)^3+3*a(n) and a(1)=9.

A145183

Continued cotangent recurrence a(n+1)=a(n)^3+3*a(n) and a(1)=9.

Terms

    a(0) =9a(1) =756a(2) =432083484

External references