a(n) = sqrt( Product_{j=1..n} Product_{k=1..6} (4*sin((2*j-1)*Pi/(2*n))^2 + 4*sin((2*k-1)*Pi/6)^2) ).

A341545

a(n) = sqrt( Product_{j=1..n} Product_{k=1..6} (4*sin((2*j-1)*Pi/(2*n))^2 + 4*sin((2*k-1)*Pi/6)^2) ).

Terms

    a(0) =200a(1) =2916a(2) =80000a(3) =2775556a(4) =105125000a(5) =4115479104a(6) =163146144200

External references