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 A271587 #17 Sep 16 2023 10:47:52
%S A271587 3,19,220,8924
%N A271587 Number of distinct minimal polynomials of n X n matrices with elements {-1, 0, +1}.
%D A271587 Steven E. Thornton & Robert M. Corless, The Bohemian Eigenvalue Project, Poster Presented at The International Symposium on Symbolic and Algebraic Computation (ISSAC 2016). Wilfrid Laurier University, July 19-22, 2016.
%H A271587 Robert Corless and Steven Thornton, <a href="http://www.bohemianmatrices.com/assets/images/posters/The_Bohemian_Eigenvalue_Project-FIRS_2017.pdf">The Bohemian Eigenvalue Project</a>, 2017 poster.
%H A271587 Steven E. Thornton, <a href="https://github.com/steventhornton/BHIME-Project">GitHub repository for code used to generate this sequence.</a>
%Y A271587 Number of characteristic polynomials A272658.
%K A271587 nonn,more,hard
%O A271587 1,1
%A A271587 _Steven E. Thornton_, Jul 13 2016