a(n) = (7*(csc(2*Pi/7))^2)^n + (7*(csc(4*Pi/7))^2)^n + (7*(csc(8*Pi/7))^2)^n.
A287396
a(n) = (7*(csc(2*Pi/7))^2)^n + (7*(csc(4*Pi/7))^2)^n + (7*(csc(8*Pi/7))^2)^n.
Terms
- a(0) =3a(1) =56a(2) =1568a(3) =53312a(4) =1931776a(5) =71300096a(6) =2645479424a(7) =98305622016
External references
- oeis: A287396