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A204222 Number of (n+1)X(n+1) 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards 0
81, 4539, 752562, 129062037, 45791699846, 13629970952083, 7163822258608797 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204230

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A006312 A183962 A174698 * A264193 A232952 A205285

Adjacent sequences:  A204219 A204220 A204221 * A204223 A204224 A204225

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 13 2012

STATUS

approved

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Last modified October 23 23:05 EDT 2021. Contains 348217 sequences. (Running on oeis4.)