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A183803 1/16 the number of (n+1)X(n+1) binary arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor 0
1, 13, 322, 16953, 1701473, 360549804, 148654946039, 127200605449247, 215287155239348168 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A183811

LINKS

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

EXAMPLE

Some solutions with upper left block zero for 3X3

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

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

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

CROSSREFS

Sequence in context: A297437 A166743 A212733 * A253458 A012492 A296395

Adjacent sequences: A183800 A183801 A183802 * A183804 A183805 A183806

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2011

STATUS

approved

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Last modified December 6 19:33 EST 2022. Contains 358648 sequences. (Running on oeis4.)