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A204302 Number of (n+1)X(n+1) 0..3 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards 0
256, 51680, 47834122, 59151473070, 211637634795580 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204309

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A114850 A017440 A237068 * A264096 A260865 A205173

Adjacent sequences: A204299 A204300 A204301 * A204303 A204304 A204305

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 14 2012

STATUS

approved

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Last modified February 1 21:16 EST 2023. Contains 359997 sequences. (Running on oeis4.)