Triangular sequence of coefficients of characteristic polynomials of a tridiagonal matrix.

Terms

a(0) =-1a(1) =1a(2) =-1a(3) =1a(4) =-1a(5) =1a(6) =1a(7) =-3a(8) =3a(9) =-1a(10) =1a(11) =-5a(12) =8a(13) =-5a(14) =1a(15) =1a(16) =-7a(17) =16a(18) =-16a(19) =7a(20) =-1a(21) =1a(22) =-9a(23) =27a(24) =-38a(25) =27a(26) =-9a(27) =1a(28) =1a(29) =-11