Coefficients of polynomials H(n,x) associated with squares of polynomials S(n,x).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =0a(5) =-6a(6) =0a(7) =1a(8) =1a(9) =0a(10) =20a(11) =0a(12) =-26a(13) =0a(14) =20a(15) =0a(16) =1a(17) =1a(18) =0a(19) =-88a(20) =0a(21) =92a(22) =0a(23) =-872a(24) =0a(25) =1990a(26) =0a(27) =-872a(28) =0a(29) =92