A236516 Number of (n+1)X(n+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise

16, 264, 9212, 655460, 99655626, 31459840764, 21144229954815, 29928295205526111, 90406983382500912004

Offset

1,1

Comments

Diagonal of A236523

Links

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

Example

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

Crossrefs

Sequence in context: A240633 A068770 A113359 * A187453 A333903 A218062

Adjacent sequences: A236513 A236514 A236515 * A236517 A236518 A236519

Keyword

nonn

Author

R. H. Hardin, Jan 27 2014

Status

approved