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A199518 Number of nX3 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to two or fewer horizontal or vertical neighbors 1
1, 45, 1260, 15400, 2513869, 174524175, 5866391058, 78538951349, 14918883751196, 1134907763429651, 40321453946092356, 558398606969183196, 113331120839472129952, 8998123036816556850222, 328615244611727182223731 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A199523

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..21

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A226981 A173000 A004350 * A075515 A330389 A243570

Adjacent sequences:  A199515 A199516 A199517 * A199519 A199520 A199521

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 07 2011

STATUS

approved

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Last modified August 14 01:00 EDT 2020. Contains 336473 sequences. (Running on oeis4.)