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.

A208163 Number of nX7 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 0 vertically.

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%I A208163 #7 Jul 22 2025 21:12:38
%S A208163 28,784,4706,28681,222487,1474641,9072707,57903614,364876262,
%T A208163 2242331814,13768713631,84428280229,514353352557,3124595619191,
%U A208163 18960957925634,114849976141130,694688437603860,4198845405962339,25361823055909609
%N A208163 Number of nX7 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 0 vertically.
%C A208163 Column 7 of A208164
%H A208163 R. H. Hardin, <a href="/A208163/b208163.txt">Table of n, a(n) for n = 1..210</a>
%e A208163 Some solutions for n=4
%e A208163 ..1..1..0..0..1..1..0....0..1..1..1..1..1..1....0..1..1..1..1..1..0
%e A208163 ..0..1..1..1..1..1..1....1..1..1..1..1..1..0....1..0..0..1..0..0..1
%e A208163 ..0..1..1..1..0..0..1....1..1..0..0..1..1..1....1..1..0..0..1..1..1
%e A208163 ..0..0..1..0..0..1..0....0..0..1..0..0..1..1....0..1..0..0..1..1..1
%K A208163 nonn
%O A208163 1,1
%A A208163 _R. H. Hardin_ Feb 24 2012