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A204677 Number of n X n 0..3 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..3 introduced in row major order 0
1, 15, 6451, 40919141, 2579588216958 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A204685

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=5

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

..2..3..1..3..3....2..0..3..3..0....2..1..1..3..2....0..2..3..1..1

..0..0..3..2..3....2..3..1..0..3....0..1..0..3..3....2..0..1..0..0

..3..2..0..1..2....0..3..2..1..0....2..2..3..2..0....0..0..3..0..1

..0..3..3..1..2....2..2..3..0..0....1..0..3..3..2....1..2..1..3..2

CROSSREFS

Sequence in context: A296177 A206360 A292972 * A198250 A066968 A113795

Adjacent sequences:  A204674 A204675 A204676 * A204678 A204679 A204680

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 18 2012

STATUS

approved

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Last modified May 21 08:31 EDT 2022. Contains 353898 sequences. (Running on oeis4.)