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 A282879 #6 Mar 02 2017 12:33:27 %S A282879 0,2,8,32,122,416,1414,4626,14930,47432,149032,463918,1432956,4397436, %T A282879 13419434,40754026,123245234,371322718,1115052844,3338521720, %U A282879 9969125698,29697147320,88271949298,261856896380,775373941754,2292071140404 %N A282879 Number of nX2 0..1 arrays with no 1 equal to more than one of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element. %C A282879 Column 2 of A282885. %H A282879 R. H. Hardin, <a href="/A282879/b282879.txt">Table of n, a(n) for n = 1..210</a> %F A282879 Empirical: a(n) = 2*a(n-1) +7*a(n-2) -2*a(n-3) -20*a(n-4) -24*a(n-5) -19*a(n-6) -14*a(n-7) -7*a(n-8) -2*a(n-9) -a(n-10). %F A282879 Empirical: G.f.: 2*x^2*(2*x+1)*(x^3+x^2+1) / ( (x^5+x^4+3*x^3+4*x^2+x-1)^2 ). - _R. J. Mathar_, Mar 02 2017 %e A282879 Some solutions for n=4 %e A282879 ..0..0. .1..0. .1..0. .1..1. .0..1. .1..0. .1..1. .1..1. .1..0. .0..0 %e A282879 ..0..0. .0..1. .0..0. .0..0. .0..1. .1..1. .0..1. .0..1. .0..1. .1..0 %e A282879 ..1..1. .1..0. .1..1. .1..1. .1..0. .0..0. .0..0. .0..0. .0..1. .1..0 %e A282879 ..0..1. .1..0. .0..1. .0..1. .0..1. .0..0. .1..1. .0..0. .0..1. .1..0 %Y A282879 Cf. A282885. %K A282879 nonn %O A282879 1,2 %A A282879 _R. H. Hardin_, Feb 24 2017