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A209963 Number of (n+1)X3 0..3 arrays containing all values 0..3 with every 2X2 subblock having one or two distinct values, and new values 0..3 introduced in row major order 1
0, 26, 665, 13529, 235614, 3745144, 56080379, 806021187, 11250016056, 153671659498, 2065329135285, 27415388492285, 360428944284258, 4702933675666684, 60999760074268959, 787454521196946391 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A209969

LINKS

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

FORMULA

Empirical: a(n) = 33*a(n-1) -374*a(n-2) +1586*a(n-3) -1093*a(n-4) -4559*a(n-5) +7212*a(n-6) -420*a(n-7) -4336*a(n-8) +2208*a(n-9) -256*a(n-10)

EXAMPLE

Some solutions for n=4

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

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

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

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

..0..2..3....2..1..3....2..0..3....2..0..3....2..1..3....2..2..3....2..2..3

CROSSREFS

Sequence in context: A170707 A170745 A218728 * A158542 A171331 A097309

Adjacent sequences:  A209960 A209961 A209962 * A209964 A209965 A209966

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 16 2012

STATUS

approved

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Last modified August 14 21:07 EDT 2018. Contains 313756 sequences. (Running on oeis4.)