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.

450, 3111, 22877, 148389, 945748, 5125790, 27587386, 130018165, 611215024, 2593349603, 10992085241, 43067682706, 168673810979, 621760259909, 2291824059768, 8059474696068, 28348577031630, 96115434260034

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical recurrence of order 79

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

Adjacent sequences: A253373 A253374 A253375 * A253377 A253378 A253379

Keyword

nonn

Author

R. H. Hardin, Dec 30 2014

Status

approved