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A207094 Number of 0..2 arrays x(0..n-1) of n elements with each no smaller than the sum of its two previous neighbors modulo 3 1
3, 6, 12, 26, 55, 115, 239, 498, 1038, 2162, 4502, 9375, 19523, 40655, 84659, 176292, 367107, 764456, 1591886, 3314907, 6902887, 14374415, 29932954, 62331700, 129798109, 270288619, 562842849, 1172051097, 2440652442, 5082358916 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A207100

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +a(n-4) -a(n-6) -a(n-9)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A099445 A004067 A092886 * A135035 A054195 A054190

Adjacent sequences:  A207091 A207092 A207093 * A207095 A207096 A207097

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 15 2012

STATUS

approved

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Last modified October 24 20:16 EDT 2014. Contains 248516 sequences.