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A258728 Number of length n+6 0..3 arrays with at most one downstep in every 6 consecutive neighbor pairs 1
2592, 5664, 13720, 35704, 92548, 228081, 526672, 1183616, 2727288, 6597449, 16454876, 40863000, 98379104, 230053160, 534172704, 1260245516, 3043544240, 7443617220, 18093595536, 43272115712, 102190186552, 241107878575 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A258730

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +80*a(n-6) -204*a(n-7) +177*a(n-8) -52*a(n-9) -125*a(n-12) +184*a(n-13) -68*a(n-14) +10*a(n-18) -4*a(n-19)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

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

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

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

CROSSREFS

Cf. A258730

Sequence in context: A252152 A035894 A179702 * A326747 A156322 A096298

Adjacent sequences:  A258725 A258726 A258727 * A258729 A258730 A258731

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 08 2015

STATUS

approved

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Last modified July 6 02:23 EDT 2022. Contains 355108 sequences. (Running on oeis4.)