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A183327 Number of nX6 binary arrays with each 1 adjacent to exactly two other 1s 1
1, 9, 37, 179, 996, 4740, 21259, 96524, 443793, 2054180, 9533062, 44194763, 204545507, 946059367, 4375861741, 20244334715, 93671407936, 433436316256, 2005547859261, 9279593479796, 42935853340895, 198660544800120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A183328

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n)=7*a(n-1)-18*a(n-2)+38*a(n-3)-48*a(n-4)+110*a(n-5)-30*a(n-6)+13*a(n-7)+12*a(n-8)-168*a(n-9)+12*a(n-10)+396*a(n-11)+2076*a(n-12)-2107*a(n-13)-11936*a(n-14)-23630*a(n-15)-11374*a(n-16)+33929*a(n-17)+86596*a(n-18)+85928*a(n-19)-5767*a(n-20)-137160*a(n-21)-186375*a(n-22)-82400*a(n-23)+98660*a(n-24)+206026*a(n-25)+154539*a(n-26)+271*a(n-27)-129682*a(n-28)-144333*a(n-29)-59907*a(n-30)+31467*a(n-31)+61883*a(n-32)+37532*a(n-33)+5039*a(n-34)-7723*a(n-35)-5583*a(n-36)-944*a(n-37)+520*a(n-38)+332*a(n-39)+24*a(n-40)-32*a(n-41)

EXAMPLE

Some solutions for 4X6

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

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

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

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

CROSSREFS

Sequence in context: A246315 A232250 A201441 * A199894 A232258 A026686

Adjacent sequences:  A183324 A183325 A183326 * A183328 A183329 A183330

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2011

STATUS

approved

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Last modified January 21 15:45 EST 2022. Contains 350479 sequences. (Running on oeis4.)