A199518 - OEIS

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, 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