A236781 Number of (n+1) X (n+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2 X 2 subblock equal.

81, 1097, 23675, 1287919, 128004881, 32223974061, 13954220420440, 15244019769376849, 29037002912540214181

Offset

1,1

Comments

Diagonal of A236789.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A236789.

Sequence in context: A264203 A236047 A264000 * A237059 A236010 A230677

Adjacent sequences: A236778 A236779 A236780 * A236782 A236783 A236784

Keyword

nonn

Author

R. H. Hardin, Jan 31 2014

Status

approved