The triangle associated with the family of polynomials W_n(x).

Terms

a(0) =1a(1) =1a(2) =1a(3) =-1a(4) =3a(5) =1a(6) =-1a(7) =5a(8) =5a(9) =1a(10) =1a(11) =7a(12) =19a(13) =7a(14) =1a(15) =1a(16) =9a(17) =71a(18) =41a(19) =9a(20) =1a(21) =-1a(22) =11a(23) =265a(24) =239a(25) =71a(26) =11a(27) =1a(28) =-1a(29) =13