A187137 Number of (n+1)X7 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

72225, 18740754, 1921749372, 245891941002, 29716252404984, 3703181282209854, 456216633873575892, 56423240969024815416

Offset

1,1

Comments

Column 6 of A187140

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for 4X7
..1..0..1..2..2..2..0....1..1..2..0..2..2..2....1..0..0..0..1..1..0
..0..0..1..2..1..1..1....0..0..0..0..2..2..1....0..0..1..0..0..2..2
..0..0..0..0..0..1..0....0..0..0..1..1..2..1....0..0..0..0..1..1..1
..0..0..0..1..1..2..0....0..0..0..1..1..1..0....0..0..0..1..2..1..1

Crossrefs

Sequence in context: A080477 A234330 A333684 * A185842 A251348 A254911

Adjacent sequences: A187134 A187135 A187136 * A187138 A187139 A187140

Keyword

nonn

Author

R. H. Hardin Mar 05 2011

Status

approved