Triangle T(n,m) = coefficient of x^n in expansion of (x^2*cotan(x))^m = sum(n>=m, T(n,m) x^n * m!^2/n!^2).
A199542
Triangle T(n,m) = coefficient of x^n in expansion of (x^2*cotan(x))^m = sum(n>=m, T(n,m) x^n * m!^2/n!^2).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =-12a(4) =0a(5) =1a(6) =0a(7) =-96a(8) =0a(9) =1a(10) =-320a(11) =0a(12) =-400a(13) =0a(14) =1a(15) =0a(16) =8640a(17) =0a(18) =-1200a(19) =0a(20) =1a(21) =-53760a(22) =0a(23) =188160a(24) =0a(25) =-2940a(26) =0a(27) =1a(28) =0a(29) =4300800
External references
- oeis: A199542