A056271 Number of primitive (aperiodic) words of length n which contain exactly six different symbols.

0, 0, 0, 0, 0, 720, 15120, 191520, 1905120, 16435440, 129230640, 953028720, 6711344640, 45674173440, 302899156560, 1969146930240, 12604139926560, 79694818842240, 499018753280880, 3100376788241040

Offset

1,6

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..20.

Formula

Sum mu(d)*A000920(n/d) where d|n.

Crossrefs

Cf. A000400, A000920, A054721.

Sequence in context: A052783 A112002 A004033 * A000920 A052779 A254079

Adjacent sequences: A056268 A056269 A056270 * A056272 A056273 A056274

Keyword

nonn

Author

Marks R. Nester

Status

approved