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 A224116 #8 Feb 06 2023 11:56:45 %S A224116 3070,30410,136990,467290,1240310,2986210,6260470,12345410,22576030, %T A224116 39299170,64929590,104218930,160450990,240932330,352487350 %N A224116 Number of idempotent 5X5 0..n matrices of rank 2. %e A224116 Some solutions for n=3 %e A224116 ..0..0..0..0..0....0..0..0..0..0....1..2..1..0..0....0..0..1..3..0 %e A224116 ..2..1..0..2..1....3..1..2..3..0....0..0..0..0..0....0..0..0..3..3 %e A224116 ..1..0..1..1..0....0..0..0..0..0....0..0..0..0..0....0..0..1..3..0 %e A224116 ..0..0..0..0..0....0..0..0..0..0....0..0..0..1..0....0..0..0..0..0 %e A224116 ..0..0..0..0..0....0..0..3..1..1....0..0..0..3..0....0..0..0..1..1 %Y A224116 Row 5 of A224114. %K A224116 nonn,more %O A224116 1,1 %A A224116 _R. H. Hardin_, Apr 09 2013