A209949 Half the number of (n+1)X7 0..2 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference

852768, 684469520, 547050257224, 437792367422004, 350242477812932534, 280228918282467201434, 224204660538155238268018, 179382625331280966120917002, 143520826707743446496036408692

Offset

1,1

Comments

Column 6 of A209951

Links

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

Example

Some solutions for n=4
..1..2..2..0..0..0..2....1..2..2..0..1..0..2....2..1..1..1..1..2..0
..2..0..0..1..0..1..1....1..2..1..0..0..2..2....1..1..2..1..2..2..1
..2..2..2..1..2..2..2....2..2..1..0..2..2..0....2..1..2..2..2..0..1
..1..2..1..1..1..2..1....2..0..1..1..0..2..2....0..2..2..1..1..2..2
..1..1..1..2..0..2..2....1..2..2..0..2..2..0....1..2..0..1..2..2..1

Crossrefs

Sequence in context: A216001 A141296 A236978 * A233716 A103913 A151939

Adjacent sequences: A209946 A209947 A209948 * A209950 A209951 A209952

Keyword

nonn

Author

R. H. Hardin Mar 16 2012

Status

approved