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 A126763 #9 Aug 10 2022 10:06:46 %S A126763 12,16,18,20,22,26 %N A126763 Weights of cusp forms satisfying certain conditions associated with a theorem of Serre and Deligne. %C A126763 Probably the list is complete. %H A126763 H. P. F. Swinnerton-Dyer, <a href="https://doi.org/10.1007/978-3-540-37802-0_1">On l-adic representations and congruences for coefficients of modular forms</a>, pp. 1-55 in Modular Functions of One Variable III, Lect. Notes Math. Vol. 350, Springer, 1973, see p. 6. %H A126763 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CuspForm.html">Cusp Form</a> %K A126763 nonn,fini %O A126763 1,1 %A A126763 _N. J. A. Sloane_, Feb 23 2007