A056383 Number of primitive (aperiodic) step shifted (decimated) sequences using a maximum of four different symbols.

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

Author

Marks R. Nester

Keywords

• nonn

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]

Crossrefs

Cf. A056371, A056373.

Formula

a(n) = Sum_{d|n} mu(d)*A056373(n/d).