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A199516 Number of nX1 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, 1, 1, 1, 10, 45, 105, 105, 1260, 6300, 15400, 15400, 200200, 1051050, 2627625, 2627625, 35735700, 192972780, 488864376, 488864376, 6844101264, 37642556952, 96197645544, 96197645544, 1374252079200, 7656547298400, 19688264481600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Column 1 of A199523

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..174

EXAMPLE

Some solutions for n=6

..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

..1....1....1....1....1....1....1....1....1....1....1....1....1....0....1....1

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

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

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

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

CROSSREFS

Sequence in context: A275623 A245871 A199350 * A001488 A009540 A010926

Adjacent sequences:  A199513 A199514 A199515 * A199517 A199518 A199519

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 07 2011

STATUS

approved

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Last modified April 23 14:15 EDT 2019. Contains 322386 sequences. (Running on oeis4.)