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A253488 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally 0
81, 1377, 4196, 10477, 32652, 113573, 415106, 1561268, 5980490, 23190284, 90686546, 356759588, 1409549210, 5586667004 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A253495

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

..2..1..1..2..1....1..2..2..1..2....2..2..2..2..2....2..2..1..1..1

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

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

CROSSREFS

Sequence in context: A231912 A116205 A237455 * A236738 A236801 A282646

Adjacent sequences:  A253485 A253486 A253487 * A253489 A253490 A253491

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 02 2015

STATUS

approved

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Last modified July 21 00:49 EDT 2019. Contains 325189 sequences. (Running on oeis4.)