A264955 Number of 3Xn arrays containing n copies of 0..3-1 with no equal horizontal or vertical neighbors.

6, 12, 36, 114, 420, 1584, 6228, 24930, 101376, 417504, 1734876, 7271238, 30667068, 130119672, 554721564, 2375331042, 10209040920, 44027206416, 190434749196, 825936571446, 3590858184996, 15646265986056, 68311732725204

Offset

1,1

Comments

Row 3 of A264954.

Links

R. H. Hardin, Table of n, a(n) for n = 1..123

Example

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

Crossrefs

Cf. A264954.

Sequence in context: A064476 A324483 A239171 * A038266 A298881 A256875

Adjacent sequences: A264952 A264953 A264954 * A264956 A264957 A264958

Keyword

nonn

Author

R. H. Hardin, Nov 29 2015

Status

approved