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A262416 Number of (n+1) X (4+1) 0..1 arrays with each row divisible by 3 and column not divisible by 3, read as a binary number with top and left being the most significant bits. 1
0, 114, 1260, 18228, 200880, 2353338, 25901100, 289462380, 3184570800, 35172555474, 386913644460, 4260476333988, 46865727906480, 515660423584938, 5672279881478700, 62399341247906460, 686393226739623600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 11*a(n-1) + 48*a(n-2) - 528*a(n-3) - 579*a(n-4) + 6369*a(n-5) + 1612*a(n-6) - 17732*a(n-7).

Empirical g.f.: 6*x^2*(19 + x - 184*x^2 + 14*x^3) / ((1 - 2*x)*(1 + 2*x)*(1 - 11*x)*(1 - 13*x^2)*(1 - 31*x^2)). - Colin Barker, Dec 31 2018

EXAMPLE

Some solutions for n=4:

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

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

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

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

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

CROSSREFS

Column 4 of A262420.

Sequence in context: A239570 A002952 A296403 * A108344 A200551 A230464

Adjacent sequences:  A262413 A262414 A262415 * A262417 A262418 A262419

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 22 2015

STATUS

approved

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Last modified September 19 17:35 EDT 2021. Contains 347564 sequences. (Running on oeis4.)