A187355 Number of (n+2)X4 0..3 arrays with every 2X2 subblock sum equal to some diagonal or antidiagonal neighbor 2X2 subblock sum

7776, 89150, 2103856, 39189180, 823266330, 16573583244, 341631507734, 6985467724796, 143826009869640, 2956672487001988, 60907232736607162, 1254431443692685380, 25855520829210572114, 532946404216704680566

Offset

1,1

Comments

Column 2 of A187356

Links

R. H. Hardin, Table of n, a(n) for n = 1..55

Example

Some solutions for 6X4
..0..2..0..2....0..0..0..2....0..0..2..0....0..0..0..2....0..2..0..2
..0..0..0..0....2..2..1..1....2..2..1..1....2..2..2..0....2..0..2..0
..0..2..0..2....0..1..0..1....1..0..1..2....0..0..0..2....1..1..1..2
..3..0..2..1....3..2..2..1....1..3..2..0....3..1..3..0....0..2..1..0
..0..3..0..1....0..1..1..2....2..0..0..0....1..1..0..3....3..0..0..1
..0..2..1..3....3..2..2..1....3..0..2..3....0..3..2..0....0..0..2..0

Crossrefs

Sequence in context: A176375 A210116 A223509 * A190465 A064782 A016865

Adjacent sequences: A187352 A187353 A187354 * A187356 A187357 A187358

Keyword

nonn

Author

R. H. Hardin Mar 08 2011

Status

approved