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A208534 Number of n-bead necklaces of 7 colors not allowing reversal, with no adjacent beads having the same color 0
7, 21, 70, 336, 1554, 7826, 39990, 210126, 1119790, 6047412, 32981550, 181402676, 1004668770, 5597460306, 31345666730, 176319474366, 995685849690, 5642220380006, 32071565263710, 182807925027504 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A208535

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A245404 A215494 A146533 * A135576 A153497 A146247

Adjacent sequences:  A208531 A208532 A208533 * A208535 A208536 A208537

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 27 2012

STATUS

approved

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Last modified May 26 02:35 EDT 2019. Contains 323579 sequences. (Running on oeis4.)