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A207209 Number of 3Xn 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal 1
25, 625, 11047, 192640, 3375548, 59151458, 1037800112, 18215805862, 319825973303, 5615850283553, 98614829798053, 1731697303682807, 30409166647098498, 533994742590497215, 9377124049344199017 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A207208

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Sequence in context: A207739 A288854 A208081 * A207203 A206858 A068180

Adjacent sequences:  A207206 A207207 A207208 * A207210 A207211 A207212

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 15 2012

STATUS

approved

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Last modified May 24 17:48 EDT 2022. Contains 354043 sequences. (Running on oeis4.)