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A204698 Number of n X n 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..2 introduced in row major order 0
1, 14, 1417, 835135, 2389914827, 34925753412578, 2568926644225402978, 954699753721419299486986 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A204705

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A280087 A240703 A240640 * A240773 A131582 A270858

Adjacent sequences:  A204695 A204696 A204697 * A204699 A204700 A204701

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 18 2012

STATUS

approved

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Last modified February 28 05:24 EST 2021. Contains 341695 sequences. (Running on oeis4.)