A250019 - OEIS

A250019

Number of length 5+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.

20, 2864, 93384, 1332504, 11215276, 65834856, 298220320, 1112201376, 3567226068, 10145447312, 26161729352, 62193634776, 138055565388, 289022674792, 575229575808, 1095429860608, 2006608664532, 3551295564720, 6094832640776

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OFFSET

1,1

COMMENTS

Row 5 of A250014

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..56

FORMULA

Empirical: a(n) = n^10 - (41/105)*n^9 + (883/168)*n^8 + (3/70)*n^7 + (593/60)*n^6 + (7/8)*n^4 + (1741/210)*n^3 - (491/70)*n^2 + (72/35)*n

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A064878 A222943 A222750 * A145405 A028458 A225989

Adjacent sequences: A250016 A250017 A250018 * A250020 A250021 A250022

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 10 2014

STATUS

approved