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A184040 1/9 the number of (n+1)X(n+1) 0..2 arrays with all 2X2 subblocks having the same four values 0
9, 21, 41, 81, 153, 297, 569, 1113, 2169, 4281, 8441, 16761, 33273, 66297 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A184048

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for 5X5

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

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

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

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

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

CROSSREFS

Sequence in context: A338911 A107890 A110209 * A242990 A053476 A110680

Adjacent sequences: A184037 A184038 A184039 * A184041 A184042 A184043

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 2011

STATUS

approved

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Last modified February 7 10:30 EST 2023. Contains 360115 sequences. (Running on oeis4.)