OFFSET
1,3
COMMENTS
See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent.
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]
FORMULA
a(n) = A002729(n) - 2.
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Added more terms (from A002729), Joerg Arndt, Aug 27 2014
STATUS
approved