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A253516 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically 0
81, 2724, 30013, 162815, 673229, 2662626, 10168992, 38531995, 145820265, 550386072, 2065878028 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A253524

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A206660 A253525 A253741 * A038398 A205902 A295252

Adjacent sequences:  A253513 A253514 A253515 * A253517 A253518 A253519

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2015

STATUS

approved

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Last modified October 19 11:26 EDT 2019. Contains 328216 sequences. (Running on oeis4.)