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A056383
Number of primitive (aperiodic) step shifted (decimated) sequences using a maximum of four different symbols.
1
4, 12, 36, 144, 276, 2124, 2796, 17760, 44184, 263004, 419868, 4278000, 5593996, 44748804, 134390724, 539036160, 1073758356, 11453725416, 15271054956, 137575549680, 366528035564, 1759219864020, 3198580043436
OFFSET
1,1
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
a(n) = Sum_{d|n} mu(d)*A056373(n/d).
CROSSREFS
Sequence in context: A331717 A192010 A252697 * A293857 A052643 A140123
KEYWORD
nonn
STATUS
approved