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 A199927 #22 Jan 05 2025 19:51:39 %S A199927 1,1,-7,3,32,-55,-95,399,-11,-2024,2573,7137,-22015,-9073,123712, %T A199927 -107499,-498119,1168399,1090985,-7323600,3535193,33005393,-59095943, %U A199927 -95072229,420022144,-36762335,-2099324671,2798230719,7241608157,-23295324088,-8015161307,128935159185,-119396284895,-509999348249 %N A199927 Trisection 0 of A199802. %C A199927 Also trisection 2 of A199744, negated. %H A199927 Hirschhorn, Michael D., <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/43-4.html">Non-trivial intertwined second-order recurrence relations</a>, Fibonacci Quart. 43 (2005), no. 4, 316-325. See p. 324. %H A199927 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-5,1,-1). %F A199927 G.f.: ( 1+2*x-x^2 ) / ( 1+x+5*x^2-x^3+x^4 ). - _R. J. Mathar_, Jun 18 2014 %Y A199927 Cf. A199744, A199802. %K A199927 sign,easy %O A199927 0,3 %A A199927 _N. J. A. Sloane_, Nov 12 2011