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A056400 Number of step shifted (decimated) sequence structures using exactly six different symbols. 0
0, 0, 0, 0, 0, 1, 4, 83, 454, 5761, 17998, 334797, 777107, 10574995, 52611728, 342199022, 1094122103, 18448004619, 38504610244, 538330833767, 2215487105217, 16330536710131, 45407723468330 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

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.

LINKS

Table of n, a(n) for n=1..23.

FORMULA

A056395(n)-A056394(n).

CROSSREFS

Cf. A056380.

Sequence in context: A158981 A007154 A056410 * A119514 A102982 A172138

Adjacent sequences:  A056397 A056398 A056399 * A056401 A056402 A056403

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified May 24 07:09 EDT 2013. Contains 225617 sequences.