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 A379550 #9 May 29 2025 16:51:06 %S A379550 1,9,49,189,651,2138,6847,21805,69781,225260,734119,2413746,7995417, %T A379550 26639534,89150537,299309821,1007213417,3394930835,11456074815, %U A379550 38688727608,130728462411,441894675073,1494097644221,5052606384210,17088501738431,57800015328528,195513178028053 %N A379550 Number of minimal edge covers in the n-trapezohedral graph. %C A379550 The sequence has been extended to n=1 using the recurrence. - _Andrew Howroyd_, May 29 2025 %H A379550 Andrew Howroyd, <a href="/A379550/b379550.txt">Table of n, a(n) for n = 1..500</a> %H A379550 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MinimalEdgeCover.html">Minimal Edge Cover</a>. %H A379550 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TrapezohedralGraph.html">Trapezohedral Graph</a>. %H A379550 <a href="/index/Rec#order_18">Index entries for linear recurrences with constant coefficients</a>, signature (13,-72,229,-489,797,-1075,1219,-1188,1028,-772,519,-315,158,-82,27,-13,2,-1). %F A379550 G.f.: x*(1 - 4*x + 4*x^2 - 29*x^3 + 150*x^4 - 334*x^5 + 507*x^6 - 525*x^7 + 296*x^8 - 153*x^9 - 11*x^10 + 26*x^11 - 58*x^12 + 9*x^13 - 16*x^14 + 2*x^15 - x^16)/((1 - 2*x - x^3)^2*(1 - 2*x + x^2 - x^3)^3*(1 - 3*x - x^2 - x^3)). - _Andrew Howroyd_, May 29 2025 %Y A379550 Cf. A356213. %K A379550 nonn,easy %O A379550 1,2 %A A379550 _Eric W. Weisstein_, Dec 25 2024 %E A379550 a(1)-a(2) and a(8) onwards from _Andrew Howroyd_, May 29 2025