A235672 Number of (n+1)X(n+1) 0..1 arrays with the difference between each 2X2 subblock maximum and minimum lexicographically nondecreasing columnwise and nonincreasing rowwise

16, 380, 28584, 6894210, 5376199876, 13578805464958, 111141360154581108, 2948319928633417670416, 253497281472306754538416318, 70644048705639953560633398930712

Offset

1,1

Comments

Diagonal of A235679

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A264073 A333581 A201617 * A235729 A189766 A235442

Adjacent sequences: A235669 A235670 A235671 * A235673 A235674 A235675

Keyword

nonn

Author

R. H. Hardin, Jan 13 2014

Status

approved