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A056366 Number of primitive (period n) bracelet structures using exactly two different colored beads. 1
0, 1, 1, 2, 3, 5, 8, 14, 21, 39, 62, 112, 189, 352, 607, 1144, 2055, 3885, 7154, 13602, 25472, 48670, 92204, 176770, 337590, 649341, 1246840, 2404872, 4636389, 8964143, 17334800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Turning over will not create a new bracelet. Permuting the colors of the beads will not change the structure. Identical to A000046 for n>1.

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

Table of n, a(n) for n=1..31.

FORMULA

A000046(n)-A000007(n-1).

CROSSREFS

Column 2 of A276543.

Cf. A056303.

Sequence in context: A034416 A306912 A212607 * A000046 A293641 A293553

Adjacent sequences:  A056363 A056364 A056365 * A056367 A056368 A056369

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified August 14 04:13 EDT 2020. Contains 336477 sequences. (Running on oeis4.)