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.

A268763 Number of nX5 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

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%I A268763 #4 Feb 13 2016 07:35:58
%S A268763 10,105,762,5170,32056,193573,1129042,6475898,36505596,203462597,
%T A268763 1122256900,6140903312,33367393732,180252797855,968778729426,
%U A268763 5183858768244,27630592631158,146768594783741,777214421588348
%N A268763 Number of nX5 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.
%C A268763 Column 5 of A268766.
%H A268763 R. H. Hardin, <a href="/A268763/b268763.txt">Table of n, a(n) for n = 1..210</a>
%F A268763 Empirical: a(n) = 4*a(n-1) +28*a(n-2) -62*a(n-3) -314*a(n-4) +78*a(n-5) +867*a(n-6) +6*a(n-7) -859*a(n-8) +46*a(n-9) +215*a(n-10) -8*a(n-11) -16*a(n-12)
%e A268763 Some solutions for n=4
%e A268763 ..1..0..1..0..0. .1..0..0..0..1. .1..0..0..0..0. .0..0..0..0..0
%e A268763 ..0..0..0..0..0. .0..0..1..0..1. .0..0..1..0..1. .0..0..0..0..0
%e A268763 ..1..0..0..0..0. .0..0..0..0..0. .0..1..0..0..0. .0..1..0..1..0
%e A268763 ..0..1..0..0..1. .1..0..0..0..1. .0..0..0..1..0. .1..0..0..0..0
%Y A268763 Cf. A268766.
%K A268763 nonn
%O A268763 1,1
%A A268763 _R. H. Hardin_, Feb 13 2016