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A230063 Number of nX3 0..2 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j) 1
0, 9, 45, 441, 3645, 31329, 266805, 2277081, 19424205, 165714129, 1413721125, 12060652041, 102890947005, 877775988609, 7488419962005, 63884675998521, 545008403548845, 4649536929125169, 39665798745571845, 338394040998364521 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A230068
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) +14*a(n-2) -8*a(n-3).
Empirical: G.f.: -9*x^2*(-1+2*x) / ( (2*x+1)*(4*x^2-9*x+1) ). - R. J. Mathar, Mar 21 2016
EXAMPLE
Some solutions for n=4
..0..1..0....2..0..2....1..2..1....0..2..0....0..1..0....0..0..0....0..2..0
..1..2..0....2..0..2....0..1..0....2..2..0....1..2..1....2..2..2....0..2..0
..0..2..1....2..2..2....0..1..0....0..0..0....1..2..0....1..2..0....2..2..0
..0..1..0....0..0..0....1..2..1....2..2..2....0..1..0....0..1..0....0..0..0
CROSSREFS
Sequence in context: A290358 A030113 A001556 * A009432 A145757 A058824
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 08 2013
STATUS
approved

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Last modified July 21 09:16 EDT 2024. Contains 374472 sequences. (Running on oeis4.)