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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 0
16, 380, 28584, 6894210, 5376199876, 13578805464958, 111141360154581108, 2948319928633417670416, 253497281472306754538416318, 70644048705639953560633398930712 (list; graph; refs; listen; history; text; internal format)
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: A027403 A264073 A201617 * A235729 A189766 A235442

Adjacent sequences:  A235669 A235670 A235671 * A235673 A235674 A235675

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 13 2014

STATUS

approved

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Last modified February 21 20:46 EST 2020. Contains 332111 sequences. (Running on oeis4.)