cp's OEIS Frontend

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.

A208697 Number of nX7 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 1 0 and 1 0 1 vertically.

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%I A208697 #7 Jul 22 2025 21:28:23
%S A208697 35,1225,8977,109599,1103081,12014735,126827983,1356513169,
%T A208697 14425723357,153741350353,1637205937955,17441454604351,
%U A208697 185777794829329,1978904120738349,21078662513667499,224526113423385269
%N A208697 Number of nX7 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 1 0 and 1 0 1 vertically.
%C A208697 Column 7 of A208698
%H A208697 R. H. Hardin, <a href="/A208697/b208697.txt">Table of n, a(n) for n = 1..210</a>
%e A208697 Some solutions for n=4
%e A208697 ..0..0..0..0..0..0..0....1..1..1..1..0..1..0....0..0..0..0..0..0..0
%e A208697 ..1..0..1..1..0..1..1....0..1..0..1..0..1..0....0..0..0..0..0..0..0
%e A208697 ..1..1..1..1..0..1..1....0..0..0..0..0..0..0....1..0..1..0..1..1..0
%e A208697 ..1..1..0..1..0..1..0....1..0..1..0..1..0..1....1..1..1..1..1..1..1
%K A208697 nonn
%O A208697 1,1
%A A208697 _R. H. Hardin_ Mar 01 2012