# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a223116 Showing 1-1 of 1 %I A223116 #4 Mar 14 2013 21:38:56 %S A223116 0,22,269,5624,64346,1435644,17231678,394101698,4795863215, %T A223116 111385873044,1367910381793,32104125661092,396732928643199, %U A223116 9380176155748724,116431632349956000,2768141124993190440,34474283501877795558 %N A223116 Number of 3Xn 0..2 arrays with exactly floor(3Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order %C A223116 Row 3 of A223114 %H A223116 R. H. Hardin, Table of n, a(n) for n = 1..51 %e A223116 Some solutions for n=3 %e A223116 ..0..0..0....0..0..0....0..1..0....0..1..0....0..1..2....0..1..1....0..1..1 %e A223116 ..1..0..2....0..1..2....1..2..0....0..2..0....0..1..2....1..1..0....2..1..2 %e A223116 ..2..0..2....0..1..2....1..0..1....2..1..1....0..0..0....0..2..0....2..0..1 %K A223116 nonn %O A223116 1,2 %A A223116 _R. H. Hardin_ Mar 14 2013 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE