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 A136725 #7 Feb 16 2025 08:33:07 %S A136725 1,2,12,20,28,36,44,52,60,68,76,84,92,100 %N A136725 Primitive dimensions of Hadamard matrices. %C A136725 In primitive dimensions, Hadamard matrices cannot be obtained as tensor products of Hadamard matrices of lower dimensions. %H A136725 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HadamardMatrix.html">Hadamard Matrix</a> %Y A136725 Cf. A007299, A136724. %K A136725 nonn,more %O A136725 1,2 %A A136725 _Artur Jasinski_, Jan 19 2008