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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 Cf. A204685. 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 September 23 06:42 EDT 2023. Contains 365533 sequences. (Running on oeis4.)