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 A290708 #9 Feb 16 2025 08:33:50 %S A290708 9,77,609,5221,44914,383279,3267224,27844845,237311925,2022585862, %T A290708 17238412156,146922412111,1252214688188,10672581690652,90962034893584, %U A290708 775266190295021,6607566186841867,56316051804768503,479979708366734131,4090849998653543166 %N A290708 Number of irredundant sets in the (2 n)-crossed prism graph. %H A290708 Andrew Howroyd, <a href="/A290708/b290708.txt">Table of n, a(n) for n = 1..200</a> %H A290708 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CrossedPrismGraph.html">Crossed Prism Graph</a> %H A290708 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IrredundantSet.html">Irredundant Set</a> %F A290708 From _Andrew Howroyd_, Aug 10 2017: (Start) %F A290708 Empirical: a(n) = 9*a(n-1) - 2*a(n-2) - 22*a(n-3) + 23*a(n-4) + 126*a(n-5) - 2*a(n-6) - 184*a(n-7) - 64*a(n-8) for n > 8. %F A290708 Empirical g.f.: x*(9 - 4*x - 66*x^2 + 92*x^3 + 630*x^4 - 12*x^5 - 1288*x^6 - 512*x^7)/(1 - 9*x + 2*x^2 + 22*x^3 - 23*x^4 - 126*x^5 + 2*x^6 + 184*x^7 + 64*x^8). %F A290708 (End) %Y A290708 Cf. A287062. %K A290708 nonn %O A290708 1,1 %A A290708 _Eric W. Weisstein_, Aug 09 2017 %E A290708 a(1) and terms a(7) and beyond from _Andrew Howroyd_, Aug 10 2017