A236820 Number of (n+1)X(n+1) 0..2 arrays with the maximum plus the minimum minus the lower median of every 2X2 subblock equal

81, 2211, 168564, 36874967, 21755065689, 36178398554012, 161548363232714369, 1994329748960606374641

Offset

1,1

Comments

Diagonal of A236828

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A250436 A237545 A253399 * A370229 A237464 A233023

Adjacent sequences: A236817 A236818 A236819 * A236821 A236822 A236823

Keyword

nonn

Author

R. H. Hardin, Jan 31 2014

Status

approved