A187138 Number of (n+1)X8 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

332937, 189091422, 34994620836, 8616423081600, 1928394629936928, 456216633873575892

Offset

1,1

Comments

Column 7 of A187140

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 4X8
..1..1..2..1..0..2..2..2....1..1..1..2..2..2..2..1....1..1..0..0..1..0..2..1
..0..0..0..0..1..2..2..2....0..0..0..0..0..0..0..0....0..0..0..0..0..0..1..0
..0..0..0..1..1..2..2..2....0..0..0..1..2..0..0..0....0..0..0..1..0..0..0..1
..0..0..0..1..0..2..0..0....0..0..0..1..0..0..2..0....0..0..0..1..0..1..0..0

Crossrefs

Sequence in context: A254358 A206658 A069337 * A185843 A261861 A234129

Adjacent sequences: A187135 A187136 A187137 * A187139 A187140 A187141

Keyword

nonn

Author

R. H. Hardin Mar 05 2011

Status

approved