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 A202653 #14 Jul 11 2021 12:50:01 %S A202653 10016,14394092,1960824272,82673548892,1704690798544,21663154469016, %T A202653 194018658663536 %N A202653 Number of 4 X 4 0..n arrays with no row or column sum equal to the previous one. %e A202653 Some solutions for n=1: %e A202653 1 1 1 1 1 1 1 1 1 0 0 0 0 1 0 0 0 0 1 0 %e A202653 1 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 %e A202653 1 0 0 1 1 0 1 0 1 1 1 1 1 1 0 0 0 0 0 0 %e A202653 0 0 0 1 1 1 1 1 1 1 0 1 0 0 1 0 1 0 0 1 %Y A202653 Row 4 of A202651. %K A202653 nonn,more %O A202653 1,1 %A A202653 _R. H. Hardin_, Dec 22 2011