A268160 Number of 3Xn arrays containing n copies of 0..3-1 with every element equal to at least one vertical or antidiagonal neighbor and the top left element equal to 0.

0, 0, 8, 14, 52, 1516, 7582, 46338, 501270, 3535396, 25480614, 220369120, 1716544860, 13279246254, 108919001860, 873463942418, 6971258302462, 56716000746978, 460015101808320, 3726764125840338, 30399952923410062

Offset

1,3

Comments

Row 3 of A268159.

Links

R. H. Hardin, Table of n, a(n) for n = 1..68

Example

Some solutions for n=4
..0..1..1..2....0..0..2..2....0..1..1..2....0..0..1..2....0..1..2..2
..0..1..2..0....0..1..2..1....0..1..0..2....0..1..2..1....0..1..2..0
..1..2..2..0....0..1..2..1....1..0..2..2....0..2..2..1....1..1..2..0

Crossrefs

Cf. A268159.

Sequence in context: A332658 A198307 A218555 * A236553 A050582 A128451

Adjacent sequences: A268157 A268158 A268159 * A268161 A268162 A268163

Keyword

nonn

Author

R. H. Hardin, Jan 27 2016

Status

approved