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A056397 Number of step shifted (decimated) sequence structures using exactly three different symbols. 0
0, 0, 1, 4, 8, 50, 54, 284, 525, 2370, 2872, 22748, 21866, 131750, 298792, 904918, 1341518, 10745090, 10748218, 72889084, 145274556, 522819590, 713023210, 5892634240, 7059926605, 35300985550, 70604008204 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

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..27.

FORMULA

A056392(n)-A056391(n).

CROSSREFS

Cf. A056377.

Sequence in context: A051681 A267987 A056407 * A189314 A215746 A128893

Adjacent sequences:  A056394 A056395 A056396 * A056398 A056399 A056400

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified March 25 11:52 EDT 2017. Contains 284076 sequences.