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A184499 1/12 the number of (n+2)X3 0..2 arrays with each 3X3 subblock containing one of one value, three of another, and five of the last 2
252, 1248, 6132, 30024, 149112, 736200, 3618864, 17994960, 88970832, 437998752, 2179485792, 10786403232, 53164931904, 264710389824, 1311266615616, 6470585244288, 32236291820160, 159828372581760, 789588076184064 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A184505

LINKS

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

FORMULA

Empirical: a(n)=3*a(n-1)+12*a(n-2)+132*a(n-3)-432*a(n-4)-1620*a(n-5)-2052*a(n-6)+10692*a(n-7)+29160*a(n-8)+7776*a(n-9)-69984*a(n-10)-139968*a(n-11)

EXAMPLE

Some solutions with a(1,1)=0 for 4X3

..0..2..1....0..2..1....0..0..1....0..1..0....0..2..0....0..2..2....0..2..1

..0..1..0....0..1..0....0..2..1....0..2..0....1..1..0....2..0..2....2..2..2

..0..0..1....0..1..0....1..0..0....0..2..2....1..0..0....0..1..2....0..2..0

..1..2..0....1..2..0....0..0..1....2..2..1....2..0..0....0..0..0....2..1..0

CROSSREFS

Sequence in context: A275316 A275315 A184505 * A154045 A172223 A154073

Adjacent sequences:  A184496 A184497 A184498 * A184500 A184501 A184502

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 16 2011

STATUS

approved

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Last modified August 16 05:47 EDT 2022. Contains 356160 sequences. (Running on oeis4.)