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A207022 Number of nX6 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically 1
18, 324, 1350, 3726, 8280, 16038, 28224, 46260, 71766, 106560, 152658, 212274, 287820, 381906, 497340, 637128, 804474, 1002780, 1235646, 1506870, 1820448, 2180574, 2591640, 3058236, 3585150, 4177368, 4840074, 5578650, 6398676, 7305930 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 6 of A207024
LINKS
FORMULA
Empirical: a(n) = (33/4)*n^4 + (45/2)*n^3 + (75/4)*n^2 - (63/2)*n.
Empirical G.f.: 18*x*(1+13*x-5*x^2+2*x^3)/(1-x)^5. [Colin Barker, May 22 2012]
EXAMPLE
Some solutions for n=4
..1..1..1..1..1..1....1..0..1..0..0..1....0..1..0..1..0..0....0..1..0..1..0..0
..0..0..1..0..1..0....0..1..0..0..1..0....0..1..0..0..1..0....0..1..0..1..0..0
..0..0..1..0..1..0....0..1..0..0..1..0....0..1..0..0..1..0....0..1..0..1..0..0
..0..0..1..0..1..0....0..1..0..0..1..0....0..1..0..0..1..0....0..1..0..1..0..0
CROSSREFS
Sequence in context: A207911 A208423 A207783 * A207366 A187381 A207109
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 14 2012
STATUS
approved

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Last modified December 10 09:31 EST 2023. Contains 367710 sequences. (Running on oeis4.)