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A267619 Number of 3Xn arrays containing n copies of 0..3-1 with every element equal to at least one horizontal or antidiagonal neighbor and the top left element equal to 0. 1
0, 2, 8, 42, 576, 5492, 68958, 814418, 9982880, 122186774, 1509756240, 18739734568, 233756282022, 2928054874344, 36812296612552, 464358008157458, 5874864170778700, 74526122250575078, 947703833383753558 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A267617.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..43

EXAMPLE

Some solutions for n=4

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

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

..2..1..1..1....1..1..2..2....1..1..2..2....2..2..1..1....2..2..1..1

CROSSREFS

Cf. A267617.

Sequence in context: A295199 A191479 A197935 * A012917 A050637 A188174

Adjacent sequences:  A267616 A267617 A267618 * A267620 A267621 A267622

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 18 2016

STATUS

approved

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Last modified September 28 01:04 EDT 2020. Contains 337388 sequences. (Running on oeis4.)