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A227084 Number of n X n binary arrays indicating whether each 2X2 subblock of a larger binary array has lexicographically increasing rows and columns, for some larger (n+1)X(n+1) binary array with rows and columns of the latter in lexicographically nondecreasing order 0
2, 12, 99, 1339, 34862, 2016091, 272856711, 87559140736 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A227089

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

..0..1..1..0....0..1..1..0....0..0..0..0....0..1..0..0....0..0..0..0

..1..1..0..0....1..1..0..1....0..0..0..1....1..1..0..0....0..1..1..0

..1..0..0..0....1..0..0..0....0..0..1..1....0..0..1..1....0..0..0..0

..0..1..0..1....0..0..1..1....0..0..0..0....1..0..1..0....0..0..0..1

CROSSREFS

Sequence in context: A012548 A012550 A009816 * A064370 A138421 A224403

Adjacent sequences:  A227081 A227082 A227083 * A227085 A227086 A227087

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 30 2013

STATUS

approved

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Last modified February 19 13:20 EST 2020. Contains 332044 sequences. (Running on oeis4.)