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A183332 Number of n X 4 binary arrays with each 1 adjacent to exactly two 0's. 1
3, 23, 66, 247, 899, 3254, 11883, 43207, 157266, 572571, 2084227, 7587166, 27619131, 100540587, 365994058, 1332312171, 4849957923, 17655092138, 64269069107, 233955917683, 851659617442, 3100259701471, 11285741436475, 41082996924906 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A183335.
LINKS
FORMULA
Empirical: a(n)=2*a(n-1)+2*a(n-2)+9*a(n-3)+14*a(n-4)+20*a(n-5)+9*a(n-6)-4*a(n-7)-24*a(n-8)-46*a(n-9)-43*a(n-10)-35*a(n-11)-16*a(n-12)+6*a(n-13)+11*a(n-14)+8*a(n-15)+7*a(n-16)+2*a(n-17)+a(n-18)+2*a(n-19).
EXAMPLE
Some solutions for 8 X 4
..0..1..1..0....0..0..0..1....0..1..0..1....1..0..1..0....0..0..0..1
..1..0..0..0....0..0..0..0....0..1..0..0....0..1..1..0....0..0..0..0
..1..0..0..0....0..0..1..1....0..1..1..0....1..1..0..0....1..1..0..0
..0..0..0..1....1..0..1..0....0..0..1..0....0..0..0..0....0..1..1..1
..0..0..0..1....1..0..1..1....0..0..1..0....0..0..1..1....0..0..0..0
..0..0..0..0....0..0..0..0....1..0..1..1....1..1..1..0....1..1..1..1
..1..1..0..0....1..1..1..1....1..0..0..0....0..0..0..0....0..0..0..0
..0..1..0..0....0..0..0..0....0..0..0..0....0..1..1..0....1..0..0..1
CROSSREFS
Sequence in context: A299511 A299311 A300112 * A358422 A196325 A003531
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2011
STATUS
approved

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Last modified June 24 00:53 EDT 2024. Contains 373661 sequences. (Running on oeis4.)