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A267656
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north or southwest neighbors modulo 4 and the upper left element equal to 0.
1
1, 3, 23, 123, 657, 4765, 36055, 256836, 1888443, 14723754, 115956869, 909264975, 7225892789, 58392353909, 474838300847, 3873384212078, 31806012334619, 262986890587398, 2183812304642653, 18194688506458428, 152189318096447967
OFFSET
1,2
COMMENTS
Row 4 of A267655.
LINKS
EXAMPLE
Some solutions for n=7
..0..1..3..3..0..2..2....0..0..2..3..0..1..3....0..1..2..0..1..2..3
..0..2..3..0..1..2..3....0..1..2..0..1..2..3....1..2..3..0..2..3..0
..1..3..0..1..1..2..3....1..2..3..1..2..3..0....1..3..0..1..2..3..0
..2..0..1..1..2..3..0....1..3..0..2..2..3..1....2..3..1..1..2..3..0
CROSSREFS
Cf. A267655.
Sequence in context: A362158 A226611 A081628 * A122883 A196424 A091055
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 19 2016
STATUS
approved