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A222979 Number of n X n 0..2 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..2 order 0
1, 4, 43, 4572, 601407, 850056406, 1202086792105, 17754195762507497, 260868222546366365309, 39377828973385121921770236 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A222986

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

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

..1..1..1....2..0..0....0..0..1....1..1..1....1..2..2....0..1..1....0..0..0

..1..1..2....0..0..0....0..2..2....1..1..0....2..2..2....1..1..1....0..0..0

CROSSREFS

Sequence in context: A015084 A176827 A220675 * A284192 A278798 A102388

Adjacent sequences:  A222976 A222977 A222978 * A222980 A222981 A222982

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 11 2013

STATUS

approved

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Last modified December 9 08:41 EST 2021. Contains 349627 sequences. (Running on oeis4.)