A206973 - OEIS

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A206973

Number of nX7 0..3 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal

0

12747, 162486009, 976568167285, 5803617279636252, 34104878476309159917

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 7 of A206974

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A254814 A275158 A206979 * A206576 A207581 A207056

Adjacent sequences: A206970 A206971 A206972 * A206974 A206975 A206976

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 14 2012

STATUS

approved