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 A224527 #5 Jun 02 2025 08:31:06 %S A224527 405,2155,5845,13525,24575,44545,69195,107925,156505,223355,301605, %T A224527 413755,535845,694695,882245 %N A224527 Number of idempotent 5X5 0..n matrices of rank 1. %C A224527 Row 5 of A224524 %e A224527 Some solutions for n=3 %e A224527 ..0..0..0..0..0....0..3..0..2..1....0..0..0..0..0....0..0..0..0..0 %e A224527 ..0..0..0..0..0....0..0..0..0..0....3..1..1..1..3....1..0..0..0..1 %e A224527 ..2..3..0..1..3....0..3..0..2..1....0..0..0..0..0....2..0..0..0..2 %e A224527 ..2..3..0..1..3....0..0..0..0..0....0..0..0..0..0....3..0..0..0..3 %e A224527 ..0..0..0..0..0....0..3..0..2..1....0..0..0..0..0....1..0..0..0..1 %K A224527 nonn %O A224527 1,1 %A A224527 _R. H. Hardin_ Apr 09 2013