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A056368 Number of primitive (period n) bracelet structures using exactly four different colored beads. 3
0, 0, 0, 1, 2, 11, 33, 136, 478, 1849, 6845, 26136, 98406, 373977, 1416249, 5380770, 20440250, 77794939, 296384565, 1131009781, 4321964735, 16541268223, 63400061153, 243358777620, 935431121460, 3600520732809 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Turning over will not create a new bracelet. Permuting the colors of the beads will not change the structure.

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..26.

FORMULA

A056363(n)-A056362(n).

CROSSREFS

Column 4 of A276543.

Cf. A056305.

Sequence in context: A085786 A034128 A034427 * A056359 A088306 A100109

Adjacent sequences:  A056365 A056366 A056367 * A056369 A056370 A056371

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified August 10 04:38 EDT 2020. Contains 336368 sequences. (Running on oeis4.)