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 A326928 #15 Oct 20 2024 20:52:47 %S A326928 1,2,6,28,154,1174,11480 %N A326928 The number of n X n symmetric real (0,1) matrices whose eigenvalues are all integers. %Y A326928 Cf. A003024. %K A326928 nonn,more %O A326928 0,2 %A A326928 _Tingyu Tao_, Oct 22 2019 %E A326928 a(0)=1 prepended by _Alois P. Heinz_, Oct 20 2024