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 A001442 #10 Jul 08 2025 00:19:14 %S A001442 1,1,0,2,1,4,0,3,0,24,0,44,4,31,0,77,0,29,0,3,0,55,0 %N A001442 G-symmetric Costas arrays of order n that are inequivalent under dihedral group. %D A001442 CRC Handbook of Combinatorial Designs, C. Colbourn and J. Dinitz, Editors, 1996, IV.7: Costas Arrays by Herbert Taylor (IV.7.6, page 259, Table 2.29). %Y A001442 Cf. A008404, A001440, A001441, A008403. %K A001442 nonn,hard,more,nice %O A001442 1,4 %A A001442 _N. J. A. Sloane_