|
Search: id:A056507
|
|
|
| A056507 |
|
Number of periodic palindromic structures using a maximum of six different symbols. |
|
+0
3
|
|
| 1, 2, 2, 5, 5, 13, 15, 41, 52, 144, 203, 577, 876, 2587, 4111
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. 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
|
No formula known - terms found by computer search.
|
|
CROSSREFS
|
Cf. A056471.
Sequence in context: A094967 A056505 A056506 this_sequence A095014 A129996 A099363
Adjacent sequences: A056504 A056505 A056506 this_sequence A056508 A056509 A056510
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
|
|
EXTENSIONS
|
Corrected by T. D. Noe (noe(AT)sspectra.com), Oct 25 2006
|
|
|
Search completed in 0.002 seconds
|
