A237559 Number of (n+1)X(n+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

81, 1536, 44828, 2161168, 159014170, 18615658788, 3615152813462, 1107896271684848

Offset

1,1

Comments

Diagonal of A237567

Links

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

Example

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

Crossrefs

Sequence in context: A236867 A203650 A284057 * A223279 A096302 A297681

Adjacent sequences: A237556 A237557 A237558 * A237560 A237561 A237562

Keyword

nonn

Author

R. H. Hardin, Feb 09 2014

Status

approved