A233014 Number of nX4 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 in row major order

14, 515, 19643, 750092, 28644884, 1093911305, 41775098873, 1595338735322, 60923990363594, 2326610975034335, 88850362536855143, 3393084193289939192, 129577640587140970544, 4948407992160122812805, 188973510753274141448453

Offset

1,1

Comments

Column 4 of A233018

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 46*a(n-1) -312*a(n-2) +530*a(n-3) -263*a(n-4)

Example

Some solutions for n=3
..0..1..1..3....0..1..1..3....0..0..1..0....0..1..0..1....0..0..1..0
..1..1..1..3....0..0..0..1....1..1..0..2....1..3..2..3....0..1..0..0
..3..3..1..1....2..2..2..3....3..1..1..0....3..1..0..1....0..0..2..2

Crossrefs

Sequence in context: A190999 A320288 A344114 * A209096 A159645 A297805

Adjacent sequences: A233011 A233012 A233013 * A233015 A233016 A233017

Keyword

nonn

Author

R. H. Hardin, Dec 03 2013

Status

approved