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A183793 1/4 the number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having sum 6 0
53, 31541, 209636605, 15624102535570, 13038188765075658693, 121880956287359200992546463 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A183802

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for 3X3

..2..2..0....1..0..3....1..2..0....0..0..2....2..1..3....0..1..0....2..3..3

..2..1..1....2..2..3....0..1..1....3..2..1....3..3..1....1..0..1....3..3..2

..3..3..3....3..0..2....1..3..0....3..2..3....3..1..3....0..1..2....2..3..1

CROSSREFS

Sequence in context: A093253 A234603 A169595 * A145332 A087530 A125037

Adjacent sequences:  A183790 A183791 A183792 * A183794 A183795 A183796

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2011

STATUS

approved

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Last modified November 22 10:31 EST 2014. Contains 249805 sequences.