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A234778 Number of (n+1)X(n+1) 0..3 arrays with no adjacent elements equal and with each 2X2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases 1
76, 6660, 2761748, 5465582060, 51845281856108, 2363085244017636364, 518342328616619031217020, 547728179121316322465056282212, 2790190676549838064460970840259520660 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A234786
LINKS
EXAMPLE
Some solutions for n=2
..2..3..1....3..2..1....1..2..3....0..3..2....2..1..3....3..1..3....3..0..1
..3..1..0....1..0..2....0..1..2....3..2..0....1..0..2....0..2..1....0..2..3
..1..2..1....3..2..1....1..2..1....0..3..2....0..2..3....3..0..2....2..0..2
CROSSREFS
Sequence in context: A004299 A049669 A198476 * A139671 A098606 A093276
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 30 2013
STATUS
approved

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Last modified April 22 01:34 EDT 2024. Contains 371887 sequences. (Running on oeis4.)