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A249703 Number of length n+3 0..4 arrays with every four consecutive terms having the maximum of some two terms equal to the minimum of the remaining two terms 1
205, 485, 1153, 2601, 5425, 11925, 27113, 61725, 137593, 307437, 694273, 1576625, 3567829, 8061981, 18257849, 41462221, 94184277, 213859241, 485808309, 1104769313, 2514006025, 5722098441, 13027345657, 29673996009, 67626829493 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A249707

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) -a(n-2) -3*a(n-3) +25*a(n-4) -39*a(n-5) -30*a(n-6) +40*a(n-7) -176*a(n-8) +78*a(n-9) +365*a(n-10) +57*a(n-11) +515*a(n-12) +361*a(n-13) -923*a(n-14) -1037*a(n-15) -1152*a(n-16) -1164*a(n-17) +750*a(n-18) +1980*a(n-19) +1872*a(n-20) +1440*a(n-21) -432*a(n-22) -1728*a(n-23) -864*a(n-24)

EXAMPLE

Some.solutions.for.n=6

..3....2....4....1....1....3....4....2....4....3....2....0....1....3....0....0

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

..3....2....4....2....3....2....1....2....0....2....2....4....1....1....3....1

..3....1....4....2....1....2....1....3....3....3....0....1....1....1....2....2

..3....4....4....4....0....4....1....2....3....3....2....1....4....0....0....1

..3....2....4....2....1....2....4....2....3....3....3....1....0....1....2....0

..4....2....4....0....1....2....1....0....3....3....2....1....1....1....2....1

..1....0....1....2....4....2....1....2....2....4....0....0....1....3....2....3

..3....2....4....4....0....4....0....4....3....2....2....1....4....0....0....1

CROSSREFS

Sequence in context: A186475 A020170 A260471 * A015974 A203870 A203863

Adjacent sequences:  A249700 A249701 A249702 * A249704 A249705 A249706

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2014

STATUS

approved

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Last modified October 28 04:43 EDT 2021. Contains 348313 sequences. (Running on oeis4.)