login
A056403
Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of four different symbols.
2
1, 1, 3, 9, 16, 102, 130, 800, 1889, 11089, 17598, 179255, 233448, 1865925, 5603767, 22468480, 44744046, 477260541, 636308684, 5732446015, 15272176563, 73301037291, 133274359128, 1466413083360
OFFSET
1,3
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
Sum mu(d)*A056393(n/d) where d|n.
CROSSREFS
Cf. A056383.
Sequence in context: A117108 A223188 A145796 * A181349 A240094 A174180
KEYWORD
nonn
STATUS
approved