|
| |
|
|
A056445
|
|
Number of primitive (period n) step cyclic shifted sequence structures using exactly three different symbols.
|
|
0
| |
|
|
0, 0, 1, 2, 3, 13, 11, 50, 71, 271, 281, 2139, 1741, 9639, 20452, 58019, 79293, 599367, 566739, 3667942, 6931300, 23775873, 31008623, 246106846, 282422549, 1357817329, 2615067894, 11358094490
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,4
|
|
|
COMMENTS
| See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent. 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.
|
|
|
FORMULA
| A056440(n)-A056439(n).
|
|
|
CROSSREFS
| Cf. A056425.
Sequence in context: A132365 A129671 A117684 * A171483 A100385 A128460
Adjacent sequences: A056442 A056443 A056444 * A056446 A056447 A056448
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
|
| |
|
|
