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A056348 Number of primitive (period n) bracelets using exactly two different colored beads. 0
0, 1, 2, 3, 6, 8, 16, 24, 42, 69, 124, 208, 378, 668, 1214, 2220, 4110, 7630, 14308, 26931, 50944, 96782, 184408, 352450, 675180, 1296477, 2493680, 4805388, 9272778, 17919558, 34669600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Turning over will not create a new bracelet. Identical to A001371 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

Sum mu(d)*A056342(n/d) where d divides n.

CROSSREFS

Cf. A001037.

Sequence in context: A133586 A141348 A029867 * A308546 A324737 A057574

Adjacent sequences:  A056345 A056346 A056347 * A056349 A056350 A056351

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified February 27 03:50 EST 2020. Contains 332299 sequences. (Running on oeis4.)