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A204972 Number of n X n 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..2 introduced in row major order 0
1, 14, 1217, 451468, 594430765, 2924321664147 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A204978

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A323181 A206613 A198712 * A209677 A137603 A160107

Adjacent sequences:  A204969 A204970 A204971 * A204973 A204974 A204975

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 21 2012

STATUS

approved

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Last modified August 17 07:10 EDT 2022. Contains 356184 sequences. (Running on oeis4.)