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 A251227 #6 Jul 23 2025 13:11:48 %S A251227 25396,2814985,304255924,33102432698,3594807908974,390586327228567, %T A251227 42432102644410392,4609884118941107106,500818517947942768226, %U A251227 54409178269320447394874,5911035284990253460656387 %N A251227 Number of (n+1)X(7+1) 0..1 arrays with no 2X2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements. %C A251227 Column 7 of A251228 %H A251227 R. H. Hardin, <a href="/A251227/b251227.txt">Table of n, a(n) for n = 1..210</a> %H A251227 R. H. Hardin, <a href="/A251227/a251227.txt">Empirical recurrence of order 99</a> %F A251227 Empirical recurrence of order 99 (see link above) %e A251227 Some solutions for n=1 %e A251227 ..1..1..1..0..1..1..1..0....1..1..0..0..1..0..1..1....0..0..1..0..1..0..0..0 %e A251227 ..1..0..0..0..0..0..1..0....0..1..1..0..1..0..0..0....0..1..0..0..1..1..1..1 %K A251227 nonn %O A251227 1,1 %A A251227 _R. H. Hardin_, Nov 30 2014