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 A224119 #5 Jun 02 2025 08:30:38 %S A224119 2050,20810,103050,368130,1042030,2563150,5576290,11164490,20782910, %T A224119 36563090,61222530,98646650,153264230,231266730,339896070 %N A224119 Number of idempotent 5X5 0..n matrices of rank 3. %C A224119 Row 5 of A224118 %e A224119 Some solutions for n=3 %e A224119 ..1..0..0..0..0....1..3..0..2..0....1..0..0..1..0....1..0..0..0..0 %e A224119 ..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..1..0..0..0 %e A224119 ..0..2..1..0..1....0..1..1..0..0....0..1..1..2..0....0..0..1..0..0 %e A224119 ..0..3..0..1..1....0..0..0..0..0....0..0..0..0..0....2..1..3..0..0 %e A224119 ..0..0..0..0..0....0..0..0..2..1....0..3..0..3..1....0..1..3..0..0 %K A224119 nonn %O A224119 1,1 %A A224119 _R. H. Hardin_ Apr 09 2013