# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a302724 Showing 1-1 of 1 %I A302724 #4 Apr 12 2018 10:51:46 %S A302724 1,7,22,83,301,1079,4064,15183,55012,207349,770421,2830250,10617371, %T A302724 39400644,145704104,544623685,2020998479,7497256552,27957348859, %U A302724 103787074017,385563034716,1435728019366,5332352333196,19821039046245 %N A302724 Number of nX3 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302724 Column 3 of A302728. %H A302724 R. H. Hardin, Table of n, a(n) for n = 1..210 %F A302724 Empirical: a(n) = 2*a(n-1) +5*a(n-2) +27*a(n-3) -64*a(n-4) -67*a(n-5) +25*a(n-6) -22*a(n-7) -66*a(n-8) -240*a(n-9) +232*a(n-10) +168*a(n-11) -16*a(n-12) +64*a(n-13) +64*a(n-14) +256*a(n-15) -256*a(n-16) %e A302724 Some solutions for n=5 %e A302724 ..0..0..0. .0..1..0. .0..0..0. .0..0..1. .0..1..1. .0..1..1. .0..0..1 %e A302724 ..1..1..1. .1..0..1. .0..0..0. .1..1..1. .0..0..1. .0..0..1. .1..1..0 %e A302724 ..1..0..1. .1..1..1. .0..1..0. .1..1..0. .1..1..1. .0..1..0. .1..0..1 %e A302724 ..0..1..0. .1..0..1. .1..1..0. .0..0..1. .0..0..1. .0..0..0. .1..0..1 %e A302724 ..1..1..1. .0..1..0. .0..0..1. .0..1..0. .1..1..0. .0..0..0. .0..1..0 %Y A302724 Cf. A302728. %K A302724 nonn %O A302724 1,2 %A A302724 _R. H. Hardin_, Apr 12 2018 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE