A056269 Number of primitive (aperiodic) words of length n which contain exactly four different symbols.

0, 0, 0, 24, 240, 1560, 8400, 40800, 186480, 818280, 3498000, 14674440, 60780720, 249393480, 1016542560, 4123132800, 16664094960, 67171179600, 270232006800, 1085569963080, 4356217672800, 17466683473800

Offset

1,4

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..22.

Formula

sum mu(d)*A000919(n/d) where d|n.

Seems to be n * A056289.

Crossrefs

Cf. A000302, A000919, A054719.

Sequence in context: A192849 A253285 A052796 * A000919 A353665 A353775

Adjacent sequences: A056266 A056267 A056268 * A056270 A056271 A056272

Keyword

nonn

Author

Marks R. Nester

Status

approved