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A253376 Number of (2+1) X (n+1) 0..2 arrays with every 2 X 2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw. 1
450, 3111, 22877, 148389, 945748, 5125790, 27587386, 130018165, 611215024, 2593349603, 10992085241, 43067682706, 168673810979, 621760259909, 2291824059768, 8059474696068, 28348577031630, 96115434260034 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirical recurrence of order 79 (see link above).
EXAMPLE
Some solutions for n=4
..0..0..1..1..0....0..0..0..0..1....0..0..1..2..1....0..2..0..0..0
..0..0..0..0..2....1..1..2..2..2....1..2..1..1..2....1..0..1..2..2
..2..0..2..1..1....2..0..1..0..2....2..0..2..2..2....1..1..1..0..1
CROSSREFS
Row 2 of A253375.
Sequence in context: A253750 A253743 A253369 * A253150 A204224 A235438
KEYWORD
nonn,changed
AUTHOR
R. H. Hardin, Dec 30 2014
STATUS
approved

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Last modified September 21 02:47 EDT 2023. Contains 365486 sequences. (Running on oeis4.)