|
| |
|
|
A056282
|
|
Number of primitive (aperiodic) word structures of length n which contain exactly six different symbols.
|
|
0
| |
|
|
0, 0, 0, 0, 0, 1, 21, 266, 2646, 22827, 179487, 1323651, 9321312, 63436352, 420693273, 2734926292, 17505749898, 110687248392, 693081601779, 4306078872557, 26585679462783, 163305339165738, 998969857983405
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,7
|
|
|
COMMENTS
| Permuting the alphabet will not change a word structure. Thus aabc and bbca have the same structure.
|
|
|
REFERENCES
| M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
|
|
|
FORMULA
| sum mu(d)*A000770(n/d) where d|n and n>0.
|
|
|
CROSSREFS
| Cf. A056271.
Sequence in context: A169895 A092794 A133717 * A000770 A133105 A032535
Adjacent sequences: A056279 A056280 A056281 * A056283 A056284 A056285
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
|
| |
|
|
