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A188303 Number of (n+1)X(n+1) binary arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums 0
0, 128, 3784, 321696, 53468700, 21615769428 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A188311

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for 3X3

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

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

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

CROSSREFS

Sequence in context: A191899 A191495 A250172 * A283813 A239441 A306412

Adjacent sequences:  A188300 A188301 A188302 * A188304 A188305 A188306

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 27 2011

STATUS

approved

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Last modified June 26 04:11 EDT 2019. Contains 324369 sequences. (Running on oeis4.)