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 A306782 #14 Mar 09 2019 20:23:51
%S A306782 2,6,30,223,3408
%N A306782 Number of distinct minimal polynomials of n X n matrices with elements {-1, 1}.
%H A306782 S. E. Thornton, <a href="http://www.bohemianmatrices.com/cpdb/unstructured/unstructured_n1_1">Properties of the Bohemian family of n x n matrices with population {-1, 1}</a>, Characteristic Polynomial Database.
%Y A306782 Number of characteristic polynomials is in A272662.
%K A306782 nonn,more,hard
%O A306782 1,1
%A A306782 _Steven E. Thornton_, Mar 09 2019