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A253448 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically 0
81, 1975, 7782, 15730, 44242, 147332, 526430, 1956194, 7444718, 28766354, 112273790, 441202754, 1742089358 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A253456

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A237957 A238038 A236088 * A205978 A037211 A238237

Adjacent sequences:  A253445 A253446 A253447 * A253449 A253450 A253451

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 01 2015

STATUS

approved

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Last modified January 18 13:55 EST 2020. Contains 331010 sequences. (Running on oeis4.)