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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.

A250972 Number of (n+1)X(7+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements.

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%I A250972 #6 Jul 23 2025 12:55:44
%S A250972 26154,3090834,364210219,43025963570,5084110136919,600808386292820,
%T A250972 71001116832347962,8390658772408694576,991579229128088199012,
%U A250972 117181450181585451488011,13848104464047186015193590
%N A250972 Number of (n+1)X(7+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements.
%C A250972 Column 7 of A250973
%H A250972 R. H. Hardin, <a href="/A250972/b250972.txt">Table of n, a(n) for n = 1..210</a>
%e A250972 Some solutions for n=1
%e A250972 ..1..0..0..1..1..1..1..1....0..1..0..1..1..0..1..0....0..1..0..1..0..1..0..0
%e A250972 ..1..1..1..0..1..0..1..0....1..1..1..1..0..1..1..1....0..1..0..1..1..0..0..1
%K A250972 nonn
%O A250972 1,1
%A A250972 _R. H. Hardin_, Nov 29 2014

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