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A227264 Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having a sum of three or less, with rows and columns of the latter in lexicographically nondecreasing order 0
2, 8, 49, 513, 10906, 498772, 48265519, 9879827545, 4332146485870 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A227269

LINKS

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

EXAMPLE

Some solutions for n=4

..1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1

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

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

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

CROSSREFS

Sequence in context: A332237 A136226 A046165 * A114619 A027047 A034491

Adjacent sequences:  A227261 A227262 A227263 * A227265 A227266 A227267

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 04 2013

STATUS

approved

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Last modified August 10 20:21 EDT 2022. Contains 356039 sequences. (Running on oeis4.)