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A206645 Number of nX3 0..2 arrays with no occurrence of three equal elements in a row horizontally or vertically, and new values 0..2 introduced in row major order 1
4, 96, 1625, 30145, 545520, 9937823, 180716227, 3287842038, 59809329737, 1088032590151, 19792964824776, 360064977265607, 6550140544959199, 119157239793862758, 2167655337437946773, 39433019182323687619 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A206650

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n)=15*a(n-1)+66*a(n-2)-145*a(n-3)+13*a(n-4)-64*a(n-5)+156*a(n-6)-36*a(n-7)-8*a(n-9)-8*a(n-10)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A204973 A204700 A267953 * A267907 A221148 A317664

Adjacent sequences:  A206642 A206643 A206644 * A206646 A206647 A206648

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 11 2012

STATUS

approved

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Last modified September 18 01:39 EDT 2021. Contains 347504 sequences. (Running on oeis4.)