A236720 Number of (n+1)X(n+1) 0..2 arrays with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock equal

81, 639, 6879, 127113, 3413516, 173486981, 12274465993, 2038592272997, 393572287740663

Offset

1,1

Comments

Diagonal of A236728

Links

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

Example

Some solutions for n=4
..0..1..0..1..0....1..1..0..2..1....2..1..1..1..0....0..1..0..1..0
..1..1..1..1..1....0..2..1..1..0....1..2..0..2..1....2..2..2..2..2
..0..1..2..1..0....1..1..0..2..1....2..1..1..1..2....2..1..0..1..2
..1..1..1..1..1....0..2..1..1..0....1..2..0..2..1....0..2..2..2..2
..1..0..1..2..1....1..1..0..2..1....1..0..2..0..1....1..2..1..0..1

Crossrefs

Sequence in context: A185856 A185848 A237629 * A187441 A187433 A269055

Adjacent sequences: A236717 A236718 A236719 * A236721 A236722 A236723

Keyword

nonn

Author

R. H. Hardin, Jan 30 2014

Status

approved