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A264955 Number of 3Xn arrays containing n copies of 0..3-1 with no equal horizontal or vertical neighbors. 1
6, 12, 36, 114, 420, 1584, 6228, 24930, 101376, 417504, 1734876, 7271238, 30667068, 130119672, 554721564, 2375331042, 10209040920, 44027206416, 190434749196, 825936571446, 3590858184996, 15646265986056, 68311732725204 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 14 18:28 EDT 2019. Contains 328022 sequences. (Running on oeis4.)