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A256815 Number of length n+7 0..1 arrays with at most two downsteps in every 7 consecutive neighbor pairs 1
219, 402, 753, 1424, 2693, 5088, 9613, 18104, 34013, 63928, 120362, 226816, 427341, 804974, 1516179, 2855304, 5376354, 10123582, 19065294, 35907400, 67626166, 127359488, 239852341, 451704432, 850669960, 1602023036, 3017039568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A256816

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) -a(n-2) +3*a(n-4) -2*a(n-5) +10*a(n-7) -7*a(n-8) -12*a(n-11) +9*a(n-12) -24*a(n-14) +18*a(n-15)

EXAMPLE

Some solutions for n=4

..1....0....1....1....0....0....0....1....1....1....1....1....0....0....0....0

..0....0....1....1....0....0....1....1....1....1....1....0....1....1....1....0

..1....0....1....1....1....1....0....1....1....1....0....1....0....1....1....0

..1....0....0....1....1....1....0....1....0....0....1....0....0....1....1....1

..0....1....1....1....0....1....0....0....0....0....0....0....0....1....1....0

..0....1....0....0....1....0....1....0....1....0....0....0....1....0....0....1

..0....0....0....0....1....0....0....0....0....1....1....1....1....0....1....1

..1....1....0....1....0....0....1....0....0....0....1....1....1....1....1....1

..1....1....0....0....1....0....1....1....0....1....1....0....1....1....0....0

..1....0....0....0....1....1....1....1....0....1....1....0....0....0....0....0

..1....0....0....1....1....0....1....1....0....1....0....1....0....0....0....0

CROSSREFS

Cf. A256816

Sequence in context: A025406 A025404 A192086 * A179580 A043435 A166836

Adjacent sequences:  A256812 A256813 A256814 * A256816 A256817 A256818

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 10 2015

STATUS

approved

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Last modified April 5 12:34 EDT 2020. Contains 333241 sequences. (Running on oeis4.)