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A254415 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally 0
81, 3279, 423141, 199339608, 310310891535, 1673449182032706, 29011762459538515234, 1740561875727381912400072, 337008848853576488534585345308 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A254422

LINKS

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

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A231768 A017797 A205207 * A017744 A232945 A223477

Adjacent sequences:  A254412 A254413 A254414 * A254416 A254417 A254418

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 30 2015

STATUS

approved

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Last modified October 25 00:01 EDT 2020. Contains 338010 sequences. (Running on oeis4.)