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A056437 Number of step cyclic shifted sequence structures using exactly five different symbols. 1
0, 0, 0, 0, 1, 3, 6, 52, 148, 1140, 2306, 30121, 48476, 478957, 1762917, 8601630, 20789656, 268188642, 431583572, 4685759111, 15045763312, 86991023001, 190548007556, 2526401808203, 4873374476388, 39199367162137 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

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]

LINKS

Table of n, a(n) for n=1..26.

FORMULA

A056432(n)-A056431(n).

CROSSREFS

Column 5 of A288627.

Cf. A056418.

Sequence in context: A111752 A102931 A056447 * A012275 A067608 A023177

Adjacent sequences:  A056434 A056435 A056436 * A056438 A056439 A056440

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified May 19 17:48 EDT 2019. Contains 323395 sequences. (Running on oeis4.)