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 A251246 #6 Jul 23 2025 13:12:22 %S A251246 351891,173028393,85032883789,41786532918513,20534495636679387, %T A251246 10090935221593972941,4958824382557190011939, %U A251246 2436834428903758977300429,1197493907250619474216993239,588464952033721324797933672285 %N A251246 Number of (n+1)X(5+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements less than the minimum of its antidiagonal elements. %C A251246 Column 5 of A251249 %H A251246 R. H. Hardin, <a href="/A251246/b251246.txt">Table of n, a(n) for n = 1..210</a> %H A251246 R. H. Hardin, <a href="/A251246/a251246.txt">Empirical recurrence of order 51</a> %F A251246 Empirical recurrence of order 51 (see link above) %e A251246 Some solutions for n=1 %e A251246 ..0..2..2..0..0..1....1..0..0..0..2..1....1..2..1..0..2..1....0..1..1..0..1..1 %e A251246 ..0..2..2..0..2..2....2..2..1..2..2..2....1..2..2..0..2..1....0..0..2..0..1..0 %K A251246 nonn %O A251246 1,1 %A A251246 _R. H. Hardin_, Dec 01 2014