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A232949 Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, and top left element zero 1
1, 21, 1881, 685251, 1074244299, 7168373617095, 205030957086979647, 25121788915317351455997, 13201474923932116066095060171, 29758989052767328125373420316820645 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A232955
LINKS
EXAMPLE
Some solutions for n=3
..0..2..0....0..1..0....0..1..0....0..1..0....0..2..0....0..0..1....0..1..3
..3..2..3....3..2..3....1..0..0....1..0..1....3..2..3....0..0..1....1..1..1
..2..3..2....3..1..0....0..0..2....2..3..1....3..2..0....0..1..0....0..0..1
CROSSREFS
Sequence in context: A203327 A297652 A243664 * A305145 A296686 A163928
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 02 2013
STATUS
approved

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Last modified February 20 21:52 EST 2024. Contains 370219 sequences. (Running on oeis4.)