# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a204080 Showing 1-1 of 1 %I A204080 #5 Mar 31 2012 12:37:00 %S A204080 0,16,256,11236,107584,3904576,76212900,1650959424,39031534096, %T A204080 864587548224,19412272036096,437675604807204,9849402103175716, %U A204080 221594251463336196,4988444738917091904,112294697209531469824 %N A204080 Number of nX4 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1 %C A204080 Column 4 of A204084 %H A204080 R. H. Hardin, Table of n, a(n) for n = 1..210 %e A204080 Some solutions for n=5 %e A204080 ..1..0..0..0....3..0..0..1....3..0..0..1....2..0..0..1....3..0..0..0 %e A204080 ..1..2..1..1....1..1..1..1....1..1..1..1....1..1..2..1....1..1..1..1 %e A204080 ..0..0..3..3....0..2..1..0....0..1..1..0....0..2..3..0....0..0..2..3 %e A204080 ..1..1..0..0....0..0..0..0....0..1..0..0....0..0..1..0....0..0..1..0 %e A204080 ..0..0..1..1....1..1..1..1....0..1..1..1....1..1..1..0....1..1..1..0 %K A204080 nonn %O A204080 1,2 %A A204080 _R. H. Hardin_ Jan 10 2012 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE