Triangle read by rows, characteristic polynomials of Cartan ring matrices.

Terms

a(0) =1a(1) =1a(2) =-2a(3) =1a(4) =-4a(5) =3a(6) =1a(7) =-6a(8) =9a(9) =-4a(10) =1a(11) =-8a(12) =20a(13) =-16a(14) =4a(15) =1a(16) =-10a(17) =35a(18) =-50a(19) =25a(20) =-4a(21) =1a(22) =-12a(23) =54a(24) =-112a(25) =105a(26) =-36a(27) =4a(28) =1a(29) =-14