A223119 - OEIS

A223119

Number of n X n 0..2 arrays with no more than floor(n X n/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

1, 10, 1154, 1780641, 12483535858, 1092037282618789, 408653905036011361072, 1924878822883438537017070318, 37532720906358968019501781345379199

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OFFSET

1,2

COMMENTS

Diagonal of A223126

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A267595 A266621 A110731 * A233252 A249849 A027879

Adjacent sequences: A223116 A223117 A223118 * A223120 A223121 A223122

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 15 2013

STATUS

approved