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A199193 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 every element equal to zero or two horizontal or vertical neighbors. 1
1, 1, 114, 11734, 86954982, 329877369234 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Diagonal of A199201.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..2..1....0..1..0..2....0..1..0..2....0..1..0..1....0..1..2..0
..3..2..0..2....2..3..2..0....2..0..3..1....1..2..3..0....3..2..1..3
..0..1..3..0....3..1..3..1....3..1..2..0....2..3..0..3....0..1..3..1
..2..3..1..3....2..0..1..3....2..3..1..3....3..2..1..2....2..0..2..3
CROSSREFS
Cf. A199201.
Sequence in context: A112485 A220685 A199249 * A188694 A188507 A189616
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 03 2011
STATUS
approved

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Last modified March 28 08:22 EDT 2024. Contains 371236 sequences. (Running on oeis4.)