Array of coefficients of powers of x^2 for S(2*n,x)^3 with Chebyshev's S polynomials A049310.

Terms

a(0) =1a(1) =-1a(2) =3a(3) =-3a(4) =1a(5) =1a(6) =-9a(7) =30a(8) =-45a(9) =30a(10) =-9a(11) =1a(12) =-1a(13) =18a(14) =-123a(15) =399a(16) =-651a(17) =588a(18) =-308a(19) =93a(20) =-15a(21) =1a(22) =1a(23) =-30a(24) =345a(25) =-1921a(26) =5598a(27) =-9540a(28) =10212a(29) =-7137