Coefficient triangle for the square of the monic integer Chebyshev T-polynomials A127672.

Terms

a(0) =4a(1) =0a(2) =1a(3) =4a(4) =-4a(5) =1a(6) =0a(7) =9a(8) =-6a(9) =1a(10) =4a(11) =-16a(12) =20a(13) =-8a(14) =1a(15) =0a(16) =25a(17) =-50a(18) =35a(19) =-10a(20) =1a(21) =4a(22) =-36a(23) =105a(24) =-112a(25) =54a(26) =-12a(27) =1a(28) =0a(29) =49