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 A005312 M2659 #27 Jul 08 2025 16:29:46 %S A005312 1,3,7,16,46,138,624 %N A005312 Maximal sum of inverse squares of the singular values of symmetric anti-Hadamard matrices of order n. %D A005312 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A005312 Noga Alon and Van H. Vu, <a href="https://doi.org/10.1006/jcta.1997.2780">Anti-Hadamard Matrices, Coin Weighing, Threshold Gates, and Indecomposable Hypergraphs</a>, Journal of Combinatorial Theory, Series A, Volume 79, Issue 1, July 1997, Pages 133-160. %H A005312 R. L. Graham and N. J. A. Sloane, <a href="http://dx.doi.org/10.1016/0024-3795(84)90090-9">Anti-Hadamard matrices</a>, Linear Alg. Applic., 62 (1984), 113-137, Table 1. %Y A005312 Cf. A005313. %K A005312 nonn,hard,more %O A005312 1,2 %A A005312 _N. J. A. Sloane_ %E A005312 Definition corrected by _Stefano Spezia_, Jan 30 2022 %E A005312 a(7) confirmed and inserted by _Stefano Spezia_, Feb 20 2022