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A246899 Number of length 7+4 0..n arrays with some pair in every consecutive five terms totalling exactly n 1
1546, 140893, 2390116, 25710385, 139555230, 647845357, 2132283592, 6483573889, 16272395890, 38904095581, 82432596396, 168949326193, 318823302406, 587124413485, 1018357762960, 1733359959937, 2819557291482, 4517952689629 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A246892

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..59

FORMULA

Empirical: a(n) = 2*a(n-1) +7*a(n-2) -16*a(n-3) -20*a(n-4) +56*a(n-5) +28*a(n-6) -112*a(n-7) -14*a(n-8) +140*a(n-9) -14*a(n-10) -112*a(n-11) +28*a(n-12) +56*a(n-13) -20*a(n-14) -16*a(n-15) +7*a(n-16) +2*a(n-17) -a(n-18)

EXAMPLE

Some solutions for n=2

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

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

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

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A038009 A249008 A249473 * A090209 A283154 A157347

Adjacent sequences:  A246896 A246897 A246898 * A246900 A246901 A246902

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 06 2014

STATUS

approved

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Last modified May 30 18:38 EDT 2020. Contains 334728 sequences. (Running on oeis4.)