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A056397 Number of step shifted (decimated) sequence structures using exactly three different symbols. +0
1
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; listen)
OFFSET

1,4

COMMENT

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.

FORMULA

A056392(n)-A056391(n).

CROSSREFS

Cf. A056377.

Sequence in context: A045882 A051681 A056407 this_sequence A128893 A123106 A123288

Adjacent sequences: A056394 A056395 A056396 this_sequence A056398 A056399 A056400

KEYWORD

nonn

AUTHOR

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

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.


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