This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A086797 #22 Jun 23 2019 02:24:32 %S A086797 0,5,-23,-283,2869,49781,-776887,-17600759,370643273,10387420489, %T A086797 -275311670611,-9201412118867,293959006143997,11414881932150269, %U A086797 -426781883555301359,-18884637964090410991,808793517812627212561,40173648337182874339601 %N A086797 Discriminant of the polynomial x^n - x - 1. %C A086797 Selmer proved that for all n the Galois group of the polynomial x^n - x - 1 over the rationals is the symmetric group S_n. [Comment corrected by _Artur Jasinski_, Feb 06 2007] %H A086797 Mohammad K. Azarian, <a href="http://www.ijpam.eu/contents/2007-36-2/9/9.pdf">On the Hyperfactorial Function, Hypertriangular Function, and the Discriminants of Certain Polynomials</a>, International Journal of Pure and Applied Mathematics, Vol. 36, No. 2, 2007, pp. 251-257. Mathematical Reviews, MR2312537. Zentralblatt MATH, Zbl 1133.11012. %H A086797 H. Osada, <a href="https://doi.org/10.1016/0022-314X(87)90029-1">The Galois groups of the polynomials X^n + a X^l + b</a>, Journal of Number Theory, Feb. 1987, vol. 25, (no.2):230-8. %H A086797 Ernst S. Selmer, <a href="https://doi.org/10.7146/math.scand.a-10478">On the irreducibility of certain trinomials</a>, Math. Scand., 4 (1956) 287-302. %F A086797 Except for the sign, the sequence alternates between the sum and difference of consecutive terms of A000312. a(n) = (n^n + (-1)^n (n-1)^(n-1))*(-1)^ceiling(1+n/2). - _T. D. Noe_, Aug 13 2004 %o A086797 (PARI) a(n)=poldisc(x^n-x-1) %Y A086797 Cf. A000312 (n^n), A007781 (n^n - (n-1)^(n-1)), A056788 (n^n + (n-1)^(n-1)). %Y A086797 Cf. A086783. %K A086797 sign %O A086797 1,2 %A A086797 Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 05 2003 %E A086797 More terms from _Benoit Cloitre_, Aug 06 2003