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 A006311 M2876 #13 Jul 08 2025 16:47:11 %S A006311 -3,10,-84,-10989,363883,-82620,-137550709,645413252986, %T A006311 -7142036935967,-7522164033404415,-217498966742521653325, %U A006311 -10590850429623318361311,14571491290875996179048369,-5355885371863393108886638462583 %N A006311 Coefficients of period polynomials. %D A006311 D. H. and Emma Lehmer, Cyclotomy for nonsquarefree moduli, pp. 276-300 of Analytic Number Theory (Philadelphia 1980), Lect. Notes Math. 899 (1981). %D A006311 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006311 Sean A. Irvine, <a href="/A006311/b006311.txt">Table of n, a(n) for n = 2..26</a> %F A006311 a(n) = [x^1] f(p,x) where p = A000040(n) and f(p,x) is defined in A006308. - _Sean A. Irvine_, Mar 08 2017 %K A006311 sign %O A006311 2,1 %A A006311 _N. J. A. Sloane_ %E A006311 More terms, signs added, and offset corrected by _Sean A. Irvine_, Mar 08 2017