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 A199249 Number of n X n 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and no element equal to any horizontal or vertical neighbor 0
 1, 1, 114, 11223, 68639138, 208100267703 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Diagonal of A199256 LINKS Table of n, a(n) for n=1..6. EXAMPLE Some solutions for n=4 ..0..1..2..3....0..1..2..0....0..1..0..1....0..1..2..3....0..1..2..1 ..3..2..3..1....2..3..1..3....1..2..3..2....1..2..0..2....3..0..3..0 ..2..0..1..0....0..1..2..1....0..3..2..0....3..1..3..0....2..3..2..1 ..3..1..0..2....3..2..0..3....3..1..3..2....1..3..0..2....3..2..1..0 CROSSREFS Sequence in context: A306194 A112485 A220685 * A199193 A188694 A188507 Adjacent sequences: A199246 A199247 A199248 * A199250 A199251 A199252 KEYWORD nonn AUTHOR R. H. Hardin Nov 04 2011 STATUS approved

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Last modified April 20 16:37 EDT 2024. Contains 371845 sequences. (Running on oeis4.)