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A206975 Number of 3Xn 0..3 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal 1
61, 3721, 180294, 8685113, 419203246, 20232472915, 976568167285, 47136598368813, 2275148053210870, 109814791045365561, 5300435987967164186, 255836290323951112260, 12348453565068178201467, 596022946181664047184360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A206974

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

..1..2..2..0....2..0..1..1....0..3..1..1....0..3..3..3....0..0..2..2

..3..0..1..1....2..0..0..2....1..2..2..0....1..3..1..2....0..1..0..1

..2..2..1..1....1..3..1..3....0..2..1..2....1..0..1..1....3..1..2..0

CROSSREFS

Sequence in context: A207231 A207224 A207011 * A206969 A206792 A206962

Adjacent sequences:  A206972 A206973 A206974 * A206976 A206977 A206978

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 14 2012

STATUS

approved

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Last modified December 4 23:10 EST 2016. Contains 278755 sequences.