A233012 Number of n X n 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

1, 11, 1202, 750092, 2555361596, 47506658438246, 4819736584585663322, 2668450108003354942469312, 8062352020337952090889367491226, 132932519318468579668067283705239149526

Offset

1,2

Comments

Diagonal of A233018

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

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

Crossrefs

Sequence in context: A067105 A237695 A180581 * A019524 A274766 A261138

Adjacent sequences: A233009 A233010 A233011 * A233013 A233014 A233015

Keyword

nonn

Author

R. H. Hardin, Dec 03 2013

Status

approved