Triangle T(n,k) = coefficient of x^n in expansion of ((2-2*cos(x))/x)^k = Sum_{n>=k} T(n,k) * x^n * (2*k)!/(n+k)!.

A199916

Triangle T(n,k) = coefficient of x^n in expansion of ((2-2*cos(x))/x)^k = Sum_{n>=k} T(n,k) * x^n * (2*k)!/(n+k)!.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =-1a(4) =0a(5) =1a(6) =0a(7) =-5a(8) =0a(9) =1a(10) =1a(11) =0a(12) =-14a(13) =0a(14) =1a(15) =0a(16) =21a(17) =0a(18) =-30a(19) =0a(20) =1a(21) =-1a(22) =0a(23) =147a(24) =0a(25) =-55a(26) =0a(27) =1a(28) =0a(29) =-85

External references