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 A202787 #8 May 11 2020 14:59:33 %S A202787 1,4322,2577513,290838284,11991502235,255657603186,3430832678207, %T A202787 32701809796548,239657412990669,1426274971770170,7169135482380621, %U A202787 31335724079805792,121778484808846083,428134536074377254,1380524064964529355,4128449284755670956 %N A202787 Number of 5 X 5 0..n arrays with row and column sums equal. %e A202787 Some solutions for n=1 %e A202787 ..1..0..1..0..1....1..0..0..1..1....1..0..0..1..1....1..0..0..1..1 %e A202787 ..0..1..1..0..1....1..1..1..0..0....0..1..1..0..1....1..1..1..0..0 %e A202787 ..1..1..0..1..0....1..1..1..0..0....0..1..1..1..0....0..1..0..1..1 %e A202787 ..1..0..0..1..1....0..1..0..1..1....1..0..1..0..1....1..1..1..0..0 %e A202787 ..0..1..1..1..0....0..0..1..1..1....1..1..0..1..0....0..0..1..1..1 %Y A202787 Row 5 of A202784. %K A202787 nonn %O A202787 0,2 %A A202787 _R. H. Hardin_, Dec 24 2011 %E A202787 a(0)=1 prepended and a(9)-a(15) from _Andrew Howroyd_, May 11 2020