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A187281 Number of (n+2)X4 0..2 arrays with every 2X2 subblock sum equal to some diagonal or antidiagonal neighbor 2X2 subblock sum 1
859, 5385, 71745, 704041, 8256093, 90158141, 1023183069, 11390667717, 128572706665, 1443678680571, 16278197524593, 183211679594853, 2065611535683245, 23276677969280185, 262456424591728473 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A187283

LINKS

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

EXAMPLE

Some solutions for 6X4

..0..1..0..0....0..1..1..1....0..1..0..1....0..0..0..1....0..1..0..0

..0..0..1..0....1..1..1..0....1..0..1..0....1..1..1..0....1..1..2..1

..0..0..0..1....1..1..0..2....2..0..1..0....0..0..0..1....2..0..0..0

..1..0..0..0....0..1..1..0....0..1..1..1....0..2..2..1....0..1..2..1

..0..2..0..0....2..0..1..0....2..0..1..0....1..0..0..1....1..1..2..1

..0..0..1..1....1..0..1..1....1..0..2..0....2..1..2..1....2..2..1..2

CROSSREFS

Sequence in context: A345548 A345801 A183628 * A108822 A278156 A249461

Adjacent sequences:  A187278 A187279 A187280 * A187282 A187283 A187284

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 07 2011

STATUS

approved

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Last modified June 30 19:43 EDT 2022. Contains 354945 sequences. (Running on oeis4.)