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A201534 Number of nX3 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 1
3, 25, 111, 633, 3354, 16393, 72811, 293831, 1087857, 3735546, 12012530, 36466979, 105202136, 289996482, 767360174, 1956720113, 4824093641, 11531663892, 26793101230, 60636948110, 133921364986, 289121431541, 611037886807 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A201539
LINKS
FORMULA
Empirical: a(n) is a polynomial of degree 26 for n>13
EXAMPLE
Some solutions for n=7
..0..0..2....0..0..1....0..0..0....0..0..2....0..0..0....0..0..0....1..1..1
..0..2..2....0..2..1....0..0..0....0..1..2....0..2..2....0..0..2....1..1..2
..1..1..0....0..2..1....0..2..2....0..1..2....1..1..2....1..1..2....1..2..2
..2..1..0....2..0..0....1..1..1....0..1..2....1..1..2....1..2..1....1..2..2
..2..2..1....2..0..0....1..1..1....0..2..2....2..1..1....1..2..1....2..1..1
..2..2..1....2..0..2....2..0..0....2..2..1....2..1..1....2..2..1....2..2..1
..2..2..1....2..2..2....2..0..0....2..2..1....2..2..1....2..2..1....2..2..1
CROSSREFS
Sequence in context: A124245 A360788 A166899 * A059457 A165206 A095664
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 02 2011
STATUS
approved

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Last modified March 28 16:34 EDT 2024. Contains 371254 sequences. (Running on oeis4.)