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 A080690 #20 Jan 21 2022 08:47:26 %S A080690 1,14,2398,5015972,128091434266,39931856138212664, %T A080690 151966368274993474937668,7059965159455454640307807067492, %U A080690 4003910412343921295679925280332950062686,27719972687144020161876951888422165049044889741764 %N A080690 Number of acyclic orientations of n X n grid graph. %H A080690 N. Calkin, C. Merino, S. Noble and M. Noy, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v10i1r4">Improved Bounds for the Number of Forests and Acyclic Orientations in the Square Lattice</a>, The Electronic Journal of Combinatorics, Volume 10(1), 2003, #R4. %H A080690 A. Pönitz, <a href="https://tubaf.qucosa.de/api/qucosa%3A22459/attachment/ATT-0/">Über eine Methode zur Konstruktion von Algorithmen für die Berechnung von Invarianten in endlichen ungerichteten Hypergraphen</a>, PhD Thesis (2004) C.3. %H A080690 Peter Tittmann, <a href="https://web.archive.org/web/20070715034048/http://www.htwm.de/~peter/research/enumeration.html">More Results</a> [Gives a(1)-a(14)] %Y A080690 Cf. A007341, A080691. %K A080690 nonn %O A080690 1,2 %A A080690 Andre Poenitz [André Pönitz], Peter Tittmann (poenitz(AT)htwm.de), Mar 03 2003 %E A080690 a(10) from _Alois P. Heinz_, Dec 21 2013