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A253741 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically 1
81, 2723, 77414, 1143174, 10966149, 64166071, 333213583, 1343634212, 4751131685, 14311629354, 39554854483, 98216242368, 227147255700, 487878952466, 998933350773, 1939409904324, 3619796162567, 6491024508035, 11307537178352 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A253749

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..21

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A018223 A206660 A253525 * A253516 A038398 A205902

Adjacent sequences:  A253738 A253739 A253740 * A253742 A253743 A253744

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 11 2015

STATUS

approved

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Last modified October 20 22:44 EDT 2019. Contains 328291 sequences. (Running on oeis4.)