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A184404 1/6 the number of (n+2)X3 0..2 arrays with each 3X3 subblock containing two of one value, three of another, and four of the last 1
1260, 16140, 201543, 2563542, 32546547, 414199395, 5273355420, 67176457326, 855995407713, 10909479199428, 139056001841799, 1772599097776482, 22596946895997162, 288073093813219107, 3672523969509460995 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A184407

LINKS

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

FORMULA

Empirical: a(n)=3*a(n-1)+87*a(n-2)+951*a(n-3)-378*a(n-4)-56196*a(n-5)-183789*a(n-6)-325296*a(n-7)-124173*a(n-8)+4381533*a(n-9)+8037954*a(n-10)+6954660*a(n-11)-19420560*a(n-12)+2834352*a(n-13)+9447840*a(n-14)+11337408*a(n-15)

EXAMPLE

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

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

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

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

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

CROSSREFS

Sequence in context: A047634 A172314 A184407 * A179725 A101469 A094208

Adjacent sequences:  A184401 A184402 A184403 * A184405 A184406 A184407

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 12 2011

STATUS

approved

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Last modified June 25 06:20 EDT 2021. Contains 345452 sequences. (Running on oeis4.)