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A056432
Step cyclic shifted sequence structures using a maximum of five different symbols.
4
1, 2, 3, 7, 8, 36, 35, 201, 393, 2370, 3971, 46094, 66675, 613439, 2139350, 10016839, 23424253, 294723254, 465082931, 4972761822, 15773188813, 90323063945, 196342666487, 2587522663248, 4967200045397, 39800811900389
OFFSET
1,2
COMMENTS
See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent. 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]
FORMULA
Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference.
CROSSREFS
Cf. A056413.
Sequence in context: A324481 A112994 A056036 * A271506 A056433 A288628
KEYWORD
nonn
STATUS
approved