OFFSET
1,2
COMMENTS
See A056371 for an explanation of step shifts. Permuting the symbols 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]
PROG
(PARI) \\ see A056391 for Polya enumeration functions
a(n) = NonequivalentStructs(StepShiftPerms(n), n); \\ Andrew Howroyd, Oct 14 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Jun 11 2017
STATUS
approved