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 A306928 #15 May 30 2024 03:06:11
%S A306928 1,3,9,25,67,233,893
%N A306928 Number of different values taken by the determinant of a real (0,1,2) matrix of order n.
%H A306928 S. E. Thornton, <a href="http://www.bohemianmatrices.com/cpdb/unstructured/unstructured_0_1_2">Properties of the Bohemian family of n x n matrices with population {0, 1, 2}</a>, Characteristic Polynomial Database.
%H A306928 Minfeng Wang, <a href="/A306928/a306928.cpp.txt">C++ program to calculate A306928</a>
%K A306928 nonn,more,hard
%O A306928 0,2
%A A306928 _Steven E. Thornton_, Mar 16 2019
%E A306928 a(6) from _Minfeng Wang_, May 29 2024