Orthogonal polynomials with all zeros integers from 2*A000217.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =-2a(5) =1a(6) =0a(7) =12a(8) =-8a(9) =1a(10) =0a(11) =-144a(12) =108a(13) =-20a(14) =1a(15) =0a(16) =2880a(17) =-2304a(18) =508a(19) =-40a(20) =1a(21) =0a(22) =-86400a(23) =72000a(24) =-17544a(25) =1708a(26) =-70a(27) =1a(28) =0a(29) =3628800