A056405 Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of six different symbols.

1, 1, 3, 9, 17, 112, 160, 1182, 3526, 27550, 60332, 863283, 1636608, 19121869, 84580104, 501914374, 1492170608, 23751681540, 47340359590, 637742792823, 2546703019081, 18317620779149, 49923584451714

Offset: 1

Author

Marks R. Nester

Keywords

• nonn

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]

Crossrefs

Cf. A056385.

Formula

Sum mu(d)*A056395(n/d) where d|n.