# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a223468 Showing 1-1 of 1 %I A223468 #5 Mar 20 2013 10:30:24 %S A223468 1,6,18,58,140,352,776,1752,3696,7904,16288,33824,68800,140544,283776, %T A223468 574336,1154816,2324992,4663808,9361920,18754560,37584896,75237376, %U A223468 150640640,301428736,603217920,1206755328,2414288896,4829265920 %N A223468 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements equal to at least one king-move neighbor, with new values introduced in row major 0..2 order %C A223468 Column 2 of A223473 %H A223468 R. H. Hardin, Table of n, a(n) for n = 1..210 %e A223468 Some solutions for n=4 %e A223468 ..0..1....0..1....0..1....0..0....0..1....0..1....0..1....0..1....0..1....0..1 %e A223468 ..2..2....2..2....2..2....1..2....2..2....1..2....1..2....2..2....2..0....2..2 %e A223468 ..0..1....0..0....1..1....0..0....0..2....1..0....0..0....0..1....1..0....1..2 %e A223468 ..2..0....1..2....2..0....2..1....2..1....2..1....2..1....2..2....2..0....2..0 %K A223468 nonn %O A223468 1,2 %A A223468 _R. H. Hardin_ Mar 20 2013 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE