login
A056359
Number of bracelet structures using exactly four different colored beads.
5
0, 0, 0, 1, 2, 11, 33, 137, 478, 1851, 6845, 26148, 98406, 374010, 1416251, 5380907, 20440250, 77795428, 296384565, 1131011633, 4321964768, 16541275068, 63400061153, 243358803904, 935431121462, 3600520831215, 13876485252323, 53546253055179, 206864927506166, 800068244639812
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
FORMULA
a(n) = A056354(n) - A056353(n).
CROSSREFS
Column 4 of A152176.
Sequence in context: A034128 A034427 A056368 * A088306 A100109 A328152
KEYWORD
nonn
EXTENSIONS
Terms a(27) and beyond from Andrew Howroyd, Oct 24 2019
STATUS
approved