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A200662 Number of 0..2 arrays x(0..n-1) of n elements with each no smaller than the sum of its three previous neighbors modulo 3 1
3, 6, 12, 24, 46, 89, 176, 350, 697, 1391, 2780, 5555, 11098, 22170, 44288, 88472, 176729, 353032, 705224, 1408771, 2814203, 5621746, 11230193, 22433834, 44814616, 89523251, 178834811, 357246713, 713648606, 1425609609, 2847847987, 5688961529 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A200668

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) -3*a(n-2) +4*a(n-3) -6*a(n-4) +7*a(n-5) -9*a(n-6) +8*a(n-7) -6*a(n-8) +5*a(n-9) -4*a(n-10) +5*a(n-11) -5*a(n-12) +2*a(n-14) -3*a(n-15) +2*a(n-16) +a(n-17) -2*a(n-18) +5*a(n-19) -3*a(n-20) +a(n-21) -a(n-22) -a(n-24) +a(n-25) -a(n-26) +a(n-27)

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Sequence in context: A163314 A018183 A196787 * A264507 A137711 A068032

Adjacent sequences:  A200659 A200660 A200661 * A200663 A200664 A200665

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 20 2011

STATUS

approved

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Last modified December 2 14:48 EST 2021. Contains 349445 sequences. (Running on oeis4.)