A236729 Number of (n+1) X (n+1) 0..2 arrays with the upper median minus the lower median of every 2 X 2 subblock equal.

81, 2471, 203517, 55635639, 48557573047, 149399847864279, 1491726036815254275, 48504233592897621172359

Offset

1,1

Comments

Diagonal of A236737.

Links

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

Example

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

Crossrefs

Cf. A236737.

Sequence in context: A123219 A205512 A297606 * A236147 A237473 A282995

Adjacent sequences: A236726 A236727 A236728 * A236730 A236731 A236732

Keyword

nonn

Author

R. H. Hardin, Jan 30 2014

Status

approved