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A250134 Number of length n+2 0..2 arrays with the medians of every three consecutive terms nondecreasing 1
27, 67, 162, 391, 900, 2026, 4530, 9975, 21694, 46871, 100571, 214396, 454934, 961550, 2025038, 4252314, 8907731, 18620476, 38854077, 80952643, 168448929, 350130660, 727093383, 1508720630, 3128504906, 6483632727, 13430463741 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A250140

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) +9*a(n-3) -15*a(n-4) +7*a(n-5) -22*a(n-6) +18*a(n-7) +a(n-8) +23*a(n-9) +4*a(n-10) -4*a(n-12) -4*a(n-13)

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A303972 A099865 A065008 * A116353 A224525 A219130

Adjacent sequences:  A250131 A250132 A250133 * A250135 A250136 A250137

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 13 2014

STATUS

approved

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Last modified June 20 17:27 EDT 2019. Contains 324234 sequences. (Running on oeis4.)