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A186932 Number of (n+1) X 3 binary arrays with every 2 X 2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2 X 2 subblock traces. 1
24, 104, 472, 1664, 6848, 27272, 108128, 431656, 1719312, 6845968, 27282352, 108671048, 432902384, 1724605424, 6870205712, 27368517688, 109028322640, 434332786176, 1730241699608, 6892737739416, 27458456022120, 109385692125040 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A186939.
LINKS
FORMULA
Empirical: a(n)=2*a(n-1)+4*a(n-2)+12*a(n-3)+4*a(n-4)+17*a(n-5)+136*a(n-6)-78*a(n-7)-269*a(n-8)-496*a(n-9)+226*a(n-10)+441*a(n-11)-110*a(n-12)+372*a(n-13)+448*a(n-15)-512*a(n-16).
EXAMPLE
Some solutions for 4 X 3
..0..0..0....0..0..0....1..1..0....1..0..1....0..1..0....1..0..0....0..1..1
..0..1..1....1..0..0....1..1..1....0..0..1....1..1..0....0..0..1....1..1..0
..1..1..0....1..1..1....1..1..0....0..0..0....0..0..0....0..0..0....1..1..1
..1..1..1....0..1..0....0..1..0....0..1..1....1..0..0....1..1..1....1..0..0
CROSSREFS
Cf. A186939.
Sequence in context: A100155 A304415 A268804 * A275506 A185743 A027265
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2011
STATUS
approved

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Last modified February 23 20:31 EST 2024. Contains 370288 sequences. (Running on oeis4.)