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A205238 Number of (n+1)X(n+1) 0..2 arrays with the number of rightwards and downwards edge increases in each 2X2 subblock differing from the number in each of its horizontal and vertical neighbors 0
81, 4158, 515162, 144087952, 96890744524, 145542216126349, 555164681243665142 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205246

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A237100 A245665 A016888 * A006312 A183962 A174698

Adjacent sequences:  A205235 A205236 A205237 * A205239 A205240 A205241

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 24 2012

STATUS

approved

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Last modified October 23 15:50 EDT 2021. Contains 348214 sequences. (Running on oeis4.)