# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a295526 Showing 1-1 of 1 %I A295526 #4 Nov 23 2017 09:23:45 %S A295526 4,29,147,774,4080,21489,113466,598374,3155426,16642084,87770692, %T A295526 462903372,2441353234,12875695490,67906455891,358138834199, %U A295526 1888825058236,9961667898631,52537860596653,277084804179135,1461345928848848 %N A295526 Number of nX3 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 2 or 4 1s. %C A295526 Column 3 of A295531. %H A295526 R. H. Hardin, Table of n, a(n) for n = 1..210 %F A295526 Empirical: a(n) = 4*a(n-1) +3*a(n-2) +15*a(n-3) +17*a(n-4) +40*a(n-5) -6*a(n-6) -12*a(n-7) +45*a(n-8) -21*a(n-9) -66*a(n-10) +7*a(n-11) +6*a(n-12) -6*a(n-13) +6*a(n-14) +a(n-15) -3*a(n-16) +a(n-18) %e A295526 Some solutions for n=5 %e A295526 ..1..1..0. .1..1..0. .0..1..0. .1..1..1. .0..0..0. .0..1..0. .1..1..0 %e A295526 ..0..1..0. .0..0..0. .0..1..1. .1..0..1. .0..1..1. .1..1..1. .0..1..1 %e A295526 ..0..0..0. .1..1..0. .0..0..1. .1..1..0. .1..1..1. .1..1..1. .1..0..0 %e A295526 ..0..0..0. .0..0..0. .1..0..1. .0..0..0. .1..1..0. .0..1..0. .1..1..1 %e A295526 ..0..1..1. .0..1..1. .1..1..0. .1..1..0. .0..0..0. .0..0..0. .0..0..1 %Y A295526 Cf. A295531. %K A295526 nonn %O A295526 1,1 %A A295526 _R. H. Hardin_, Nov 23 2017 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE