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A267344 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north, west or southwest neighbors modulo 4 and the upper left element equal to 0. 1
1, 1, 2, 12, 45, 135, 388, 1220, 5401, 27146, 125333, 515897, 2010472, 8064508, 34936670, 159444254, 725890833, 3205348045, 13816812300, 59601118346, 262631332138, 1183293213009, 5373170070242, 24253891624959, 108483481246313 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Row 4 of A267338.
LINKS
EXAMPLE
Some solutions for n=5
..0..1..1..2..3....0..1..2..3..0....0..1..1..2..3....0..1..1..2..3
..0..1..2..2..3....1..2..2..3..0....0..1..2..3..3....0..1..2..2..3
..0..1..2..3..3....1..2..3..3..0....0..1..2..3..0....0..1..2..3..0
..0..1..2..3..0....1..2..3..0..1....1..2..2..3..0....1..2..3..3..0
CROSSREFS
Cf. A267338.
Sequence in context: A009074 A371487 A356868 * A275132 A276294 A066258
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 13 2016
STATUS
approved

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Last modified July 19 22:34 EDT 2024. Contains 374441 sequences. (Running on oeis4.)