A056402 Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of three different symbols.

1, 1, 3, 8, 13, 65, 67, 322, 573, 2495, 2979, 23294, 22217, 133081, 300947, 909050, 1345633, 10766559, 10762819, 72954582, 145362861, 523026545, 713213955, 5893685746, 7060765719, 35303760331

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]

Links

Table of n, a(n) for n=1..26.

Formula

Sum mu(d)*A056392(n/d) where d|n.

Crossrefs

Cf. A056382.

Sequence in context: A281267 A346054 A153891 * A366071 A305179 A106386

Adjacent sequences: A056399 A056400 A056401 * A056403 A056404 A056405

Keyword

nonn

Author

Marks R. Nester

Status

approved