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A210303 Number of (n+1)X3 0..3 arrays containing all values 0..3 with every 2X2 subblock having one or three distinct values, and new values 0..3 introduced in row major order 1
29, 1091, 27957, 655743, 14976529, 339125187, 7657326365, 172736626311, 3895426271881, 87837486236459, 1980567115521301, 44657472344530991, 1006924739685862081, 22703839965026573971, 511919216667906316429 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A210309

LINKS

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

FORMULA

Empirical: a(n) = 35*a(n-1) -315*a(n-2) +729*a(n-3) +1132*a(n-4) -3804*a(n-5) +688*a(n-6) +1536*a(n-7)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A237356 A176695 A243623 * A268461 A025761 A003735

Adjacent sequences:  A210300 A210301 A210302 * A210304 A210305 A210306

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 19 2012

STATUS

approved

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Last modified April 7 01:03 EDT 2020. Contains 333291 sequences. (Running on oeis4.)