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A267620 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one horizontal or antidiagonal neighbor and the top left element equal to 0. 0
0, 6, 48, 906, 59328, 2192682, 131218206, 6966218352, 394140187926, 22353391341810 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A267617.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A267617.

Sequence in context: A291104 A108092 A052744 * A275334 A192769 A324461

Adjacent sequences:  A267617 A267618 A267619 * A267621 A267622 A267623

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 18 2016

STATUS

approved

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Last modified October 19 15:34 EDT 2021. Contains 348091 sequences. (Running on oeis4.)