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A251275 Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element 1
230, 164800, 1497752279, 172919373209920, 253597772369472323328, 4724687679127024503784365440, 1118224116880857883546078105623321344, 3362121790823480902189703776276345356341787648 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A251283

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..9

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A231107 A231251 A051183 * A323321 A156742 A031965

Adjacent sequences:  A251272 A251273 A251274 * A251276 A251277 A251278

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 01 2014

STATUS

approved

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Last modified April 10 11:15 EDT 2021. Contains 342845 sequences. (Running on oeis4.)