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 A008403 #12 Jul 08 2025 01:03:30 %S A008403 0,0,0,0,1,1,0,3,0,14,0,32,4,31,0,45,0,2,0,3,0,0,0 %N A008403 G-symmetric Costas arrays of order n that are inequivalent under dihedral group but are not given by the Welch construction. %D A008403 CRC Handbook of Combinatorial Designs, C. Colbourn and J. Dinitz, Editors, IV.7: Costas Arrays by Herbert Taylor (IV.7.6, page 259, Table 2.29). %H A008403 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CostasArray.html">Costas Array</a> %Y A008403 Cf. A008404, A001440, A001441, A001442. %K A008403 nonn,hard,more %O A008403 1,8 %A A008403 _N. J. A. Sloane_