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A280852 Number of n X n 0..2 arrays with no element equal to more than one of its king-move neighbors and with new values introduced in order 0 sequentially upwards. 0
1, 9, 46, 124, 282, 712, 1738, 4124, 9562, 21752, 48730, 107992, 237082, 516376, 1117210 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A280859.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A280859.

Sequence in context: A224851 A042003 A117052 * A009294 A061620 A260513

Adjacent sequences:  A280849 A280850 A280851 * A280853 A280854 A280855

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 09 2017

STATUS

approved

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Last modified June 28 02:57 EDT 2022. Contains 354903 sequences. (Running on oeis4.)