%I #11 Jan 14 2019 03:10:17
%S 5,-31,-23,-283,-400,-283,3381,3017,3233,2869,49781,61504,91125,33856,
%T 49781,-870199,-811043,-830455,-816631,-836043,-776887,-17600759,
%U -20502784,-16861591,-40960000,-16861591,-20502784,-17600759,404197705,384126317,586376253
%N Triangle of the discriminant of the polynomials x^n + x^m - 1, where 0 < m < n.
%C Boyd et al. mention these numbers.
%H T. D. Noe, <a href="/A238196/b238196.txt">Rows n = 1..100 of triangle, flattened</a>
%H David W. Boyd, Greg Martin, and Mark Thom, <a href="http://arxiv.org/abs/1402.5148">Squarefree values of trinomial discriminants</a>, arXiv 1402.5148 [math.NT], 2014.
%H William Craig, <a href="https://arxiv.org/abs/1901.03653">Cubefree Trinomial Discriminants</a>, arXiv:1901.03653 [math.NT], 2019.
%t Flatten[Table[Discriminant[x^n + x^m - 1, x], {n, 2, 9}, {m, n - 1}]]
%o (PARI) {T(n, m) = if( m<=0 || m>=n, 0, poldisc( x^n + x^m - 1))}; /* _Michael Somos_, Feb 24 2014 */
%Y Cf. A238195 (discriminant of x^n - x^m - 1).
%Y Cf. A238197 (discriminant of x^n + x^m + 1).
%Y Cf. A238198 (discriminant of x^n - x^m + 1).
%Y Cf. A238199 (union).
%K sign,tabl
%O 1,1
%A _T. D. Noe_, Feb 24 2014