A187280 Number of (n+2) X 3 0..2 arrays with every 2 X 2 subblock sum equal to some diagonal or antidiagonal neighbor 2 X 2 subblock sum.

711, 859, 20529, 79499, 868277, 5031413, 43307435, 292250165, 2308333343, 16530790801, 126385412189, 927198993151, 6998506191721, 51873562337879, 389498512776673, 2900304246591069, 21729379461164643, 162152529828908201

Offset

1,1

Comments

Column 1 of A187283.

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 4 X 3
..1..2..0....1..2..0....1..2..2....2..0..2....0..2..2....1..0..1....0..1..1
..1..2..1....1..0..2....1..0..0....1..1..1....2..0..0....1..1..1....1..2..0
..0..2..1....1..2..0....1..2..2....1..1..1....0..2..2....1..0..1....1..0..2
..2..2..0....1..0..2....1..0..0....2..0..2....2..0..0....1..1..1....2..1..1

Crossrefs

Cf. A187283.

Sequence in context: A220593 A252965 A187283 * A265197 A269060 A265142

Adjacent sequences: A187277 A187278 A187279 * A187281 A187282 A187283

Keyword

nonn

Author

R. H. Hardin, Mar 07 2011

Status

approved