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A183783 Half the number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having sum 4 0
31, 3552, 2214457, 7635071835, 144396520117972, 15033760617564577257, 8603578492435516321649249, 27081302315719663051228636805358 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A183792

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for 3X3

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

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

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

CROSSREFS

Sequence in context: A262926 A330398 A218661 * A072913 A001237 A289397

Adjacent sequences:  A183780 A183781 A183782 * A183784 A183785 A183786

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2011

STATUS

approved

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Last modified September 27 07:28 EDT 2021. Contains 347673 sequences. (Running on oeis4.)