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 A351240 #7 Feb 06 2022 23:06:13 %S A351240 1,2,7,10,37,34,107,262,661,2236,5665,13350,35141,260188,382614, %T A351240 418134,9552743681459,83369851038,785598689 %N A351240 Numerator of the maximal sum of inverse squares of the singular values of symmetric Toeplitz anti-Hadamard matrices of order n. %H A351240 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. %Y A351240 Cf. A005312, A005313, A351241 (denominator). %K A351240 nonn,frac,more %O A351240 1,2 %A A351240 _Stefano Spezia_, Feb 05 2022