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A223005 Number of n X n 0..1 arrays with no more than floor(n X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order 0
1, 4, 24, 840, 35471, 8156595, 2073830655, 2804191942757, 4149994855051281, 32191007835248846536, 272625366029849993313502, 11994700692484110855119938470 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A223012

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A058171 A196866 A326794 * A009043 A024251 A193484

Adjacent sequences:  A223002 A223003 A223004 * A223006 A223007 A223008

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 11 2013

STATUS

approved

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Last modified January 18 06:51 EST 2022. Contains 350453 sequences. (Running on oeis4.)