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 A306794 #8 Mar 11 2019 04:11:24
%S A306794 2,5,15,119,2297,145213
%N A306794 Number of distinct real eigenvalues of n X n matrices with elements {-1, 1}.
%H A306794 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 A306794 Number of distinct eigenvalues is in A306791.
%Y A306794 Number of characteristic polynomials is in A272662.
%Y A306794 Number of minimal polynomials is in A306782.
%K A306794 nonn,more,hard
%O A306794 1,1
%A A306794 _Steven E. Thornton_, Mar 10 2019