1,4

Turning over the necklace is not allowed. Colors may be permuted without changing the necklace structure.

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.

A000013(n)-1.

See A000013.

Cf. A052823.

Sequence in context: A066983 A048240 A122012 this_sequence A117525 A075149 A161618

Adjacent sequences: A056292 A056293 A056294 this_sequence A056296 A056297 A056298

nonn,easy

Marks R. Nester (nesterm(AT)dpi.qld.gov.au)