login
A267619
Number of 3 X n 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
OFFSET
1,2
COMMENTS
Row 3 of A267617.
LINKS
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 A349145
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 18 2016
STATUS
approved