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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
OFFSET
1,5
COMMENTS
Column 1 of A199523
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 07 2011
STATUS
approved