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 A214013 #8 Jul 22 2025 23:06:51 %S A214013 24950,9318805,641631566,17609835599,269462676001,2747459653062, %T A214013 20767436139206,124705556762920,623826151413581,2689745345189961, %U A214013 10252109460663720,35217218076189536,110684300106966444 %N A214013 Number of 4X4 nonnegative integer matrices with row and column i=1..4 having sum <= i*n. %C A214013 Row 4 of A214011 %H A214013 R. H. Hardin, <a href="/A214013/b214013.txt">Table of n, a(n) for n = 1..16</a> %e A214013 Some solutions for n=3 %e A214013 ..0..0..0..0....0..0..0..2....0..0..3..0....1..2..0..0....0..0..0..0 %e A214013 ..0..6..0..0....0..1..2..3....0..4..0..0....0..0..4..0....0..0..0..0 %e A214013 ..0..0..3..0....0..1..6..0....0..0..6..0....0..0..0..0....0..2..2..4 %e A214013 ..2..0..6..3....0..0..0..0....0..1..0..9....0..3..0..0....0..4..3..0 %K A214013 nonn %O A214013 1,1 %A A214013 _R. H. Hardin_ Jun 30 2012