a(n) = sqrt( Product_{1<=j, k<=n-1} (4*sin(j*Pi/n)^2 + 4*cos(k*Pi/n)^2) ).
A340563
a(n) = sqrt( Product_{1<=j, k<=n-1} (4*sin(j*Pi/n)^2 + 4*cos(k*Pi/n)^2) ).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =16a(4) =384a(5) =30976a(6) =7741440a(7) =6369316864
External references
- oeis: A340563