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A056283 Number of n-bead necklaces with exactly three different colored beads. 7
0, 0, 2, 9, 30, 91, 258, 729, 2018, 5613, 15546, 43315, 120750, 338259, 950062, 2678499, 7573350, 21480739, 61088874, 174184755, 497812638, 1425847623, 4092087522, 11765822365, 33887517870, 97756387365, 282414624746, 816999710223, 2366509198350, 6862930841141 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Turning over the necklace is not allowed.

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..1000

FORMULA

A001867(n)-3*A000031(n)+3.

CROSSREFS

Cf. A001867, A052823.

Column k=3 of A087854.

Sequence in context: A056288 A261174 A273652 * A192518 A277241 A201164

Adjacent sequences:  A056280 A056281 A056282 * A056284 A056285 A056286

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified November 20 13:59 EST 2017. Contains 294972 sequences.