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A056387
Number of primitive (aperiodic) step shifted (decimated) sequences using exactly three different symbols.
1
0, 0, 3, 21, 39, 285, 309, 1638, 3099, 14109, 17157, 135918, 130995, 789819, 1791447, 5425938, 8047839, 64463793, 64486017, 437310162, 871626729, 3136882659, 4278115101, 35355495078, 42359479599
OFFSET
1,3
COMMENTS
See A056371 for an explanation of step shifts.
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
Sum mu(d)*A056377(n/d) where d|n.
CROSSREFS
Sequence in context: A076169 A298035 A178082 * A056377 A146712 A364051
KEYWORD
nonn
STATUS
approved