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A056397
Number of step shifted (decimated) sequence structures using exactly three different symbols.
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
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. [See A056391 for pdf file of Chap. 2]
FORMULA
CROSSREFS
Column 3 of A288620.
Cf. A056377.
Sequence in context: A267987 A056407 A329942 * A369074 A189314 A358791
KEYWORD
nonn
STATUS
approved