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A250018 Number of length 4+5 0..n arrays with no six consecutive terms having the maximum of any three terms equal to the minimum of the remaining three terms 1
20, 1612, 35440, 375756, 2499284, 12088256, 46481536, 150444840, 425961012, 1083934148, 2528257072, 5485610260, 11197641780, 21695822168, 40183275392, 71552257168, 123070684884, 205276219260, 333121856624, 527422812316 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A250014

LINKS

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

FORMULA

Empirical: a(n) = n^9 + (27/70)*n^8 + (146/35)*n^7 + (29/10)*n^6 + (36/5)*n^5 + (29/10)*n^4 - (14/15)*n^3 + (267/70)*n^2 - (151/105)*n

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A177610 A130040 A331563 * A177604 A177621 A177628

Adjacent sequences:  A250015 A250016 A250017 * A250019 A250020 A250021

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 10 2014

STATUS

approved

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Last modified April 11 14:58 EDT 2021. Contains 342886 sequences. (Running on oeis4.)