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 A082104 #29 Feb 16 2025 08:32:48 %S A082104 1,2,4,11,33,151,988,11453,247357,10608128,901029366,148187993520 %N A082104 Number of distinct characteristic polynomials among all simple undirected graphs on n nodes. %H A082104 Andries E. Brouwer, <a href="http://www.win.tue.nl/~aeb/graphs/cospectral/cospectralA.html">Numbers of characteristic polynomials and cospectral graphs for A</a> %H A082104 A. E. Brouwer and E. Spence, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v16i1n20">Cospectral graphs on 12 vertices</a>, Electr. J. Combin. 16 (2009) N20. (p. 199). %H A082104 Lorentz Jäntschi and Sorana D. Bolboacă, <a href="https://doi.org/10.1201/9780429022944-7">Characteristic Polynomial</a>, Chapter 7, New Frontiers in Nanochemistry, 1st ed., Apple Academic Press, 2020. %H A082104 Dan-Marian Joiţa and Lorentz Jäntschi, <a href="https://doi.org/10.3390/math5040084">Extending the Characteristic Polynomial for Characterization of C_20 Fullerene Congeners</a>, Mathematics (2017), 5(4), 84. %H A082104 E. Spence, <a href="http://www.maths.gla.ac.uk/~es/cospec/cospec.html"> Numbers of characteristic polynomials and cospectral graphs for A</a> %H A082104 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CharacteristicPolynomial.html">Characteristic Polynomial</a> %Y A082104 Cf. A000088. %K A082104 nonn,hard,more %O A082104 1,2 %A A082104 _Eric W. Weisstein_, Apr 03 2003 %E A082104 One term added by _Andries E. Brouwer_, Apr 09 2009 %E A082104 Two more terms from _Ruperto Corso_, Dec 18 2011