A253399 Number of (n+1) X (n+1) 0..2 arrays with every 2 X 2 subblock diagonal maximum plus antidiagonal minimum unequal to its neighbors horizontally, vertically and ne+sw antidiagonally.

81, 2192, 27362, 403698, 7257328, 196170260, 4643086490, 176392793534, 7735283529732, 473507980691236, 33662526487544248, 4000330502181468930, 385260385567127025928, 74373894362155945768362

Offset

1,1

Comments

Diagonal of A253407.

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

Some solutions for n=3
..1..0..2..2....2..1..1..1....1..0..1..2....0..1..0..0....2..0..1..2
..1..0..0..0....1..0..2..2....0..1..2..2....2..1..1..0....1..0..0..1
..2..2..1..0....2..0..0..2....0..0..0..2....1..2..1..1....0..1..2..2
..2..1..0..1....0..2..1..2....1..2..0..1....0..1..1..0....0..0..0..2

Crossrefs

Cf. A253407.

Sequence in context: A237722 A250436 A237545 * A236820 A370229 A237464

Adjacent sequences: A253396 A253397 A253398 * A253400 A253401 A253402

Keyword

nonn

Author

R. H. Hardin, Dec 31 2014

Status

approved