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A245994 Number of length n+2 0..7 arrays with no pair in any consecutive three terms totalling exactly 7 1
344, 2120, 13064, 80504, 496088, 3057032, 18838280, 116086712, 715358552, 4408238024, 27164786696, 167396958200, 1031546535896, 6356676173576, 39171603577352, 241386297637688, 1487489389403480, 9166322634058568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A245995

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +a(n-2).

Empirical: G.f.: -8*x*(43+7*x) / ( -1+6*x+x^2 ). - R. J. Mathar, Aug 10 2014

EXAMPLE

Some solutions for n=4

..5....1....5....1....7....6....7....7....0....4....2....7....0....1....7....6

..6....0....3....3....6....6....4....1....6....1....6....5....2....3....6....5

..3....0....3....3....5....2....6....7....2....5....0....5....0....7....2....4

..7....4....5....3....4....2....4....5....4....3....6....1....1....7....7....1

..3....6....3....2....7....2....6....1....1....5....6....0....5....6....7....2

..7....5....6....3....1....7....6....3....0....6....6....0....7....5....7....2

CROSSREFS

Sequence in context: A237243 A183680 A183674 * A246630 A250921 A262791

Adjacent sequences:  A245991 A245992 A245993 * A245995 A245996 A245997

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 09 2014

STATUS

approved

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Last modified June 17 15:38 EDT 2021. Contains 345085 sequences. (Running on oeis4.)