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A056400 Number of step shifted (decimated) sequence structures using exactly six different symbols. 1
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. [See A056391 for pdf file of Chap. 2]

LINKS

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

FORMULA

A056395(n)-A056394(n).

CROSSREFS

Column 6 of A288620.

Cf. A056380.

Sequence in context: A291371 A007154 A056410 * A248382 A292409 A333458

Adjacent sequences:  A056397 A056398 A056399 * A056401 A056402 A056403

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified September 26 16:43 EDT 2020. Contains 337374 sequences. (Running on oeis4.)