|
Search: id:A056470
|
|
|
| A056470 |
|
Number of palindromic structures using a maximum of five different symbols. |
|
+0
4
|
|
| 1, 1, 2, 2, 5, 5, 15, 15, 52, 52, 202, 202, 855, 855, 3845, 3845, 18002, 18002, 86472, 86472, 422005, 422005, 2079475, 2079475, 10306752, 10306752, 51263942, 51263942, 255514355, 255514355, 1275163905
(list; graph; listen)
|
|
|
OFFSET
|
1,3
|
|
|
COMMENT
|
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
|
Sum stirling2( [(n+1)/2], k) for k from 1 to 5.
|
|
CROSSREFS
|
Cf. A056451.
Sequence in context: A098887 A097438 A055879 this_sequence A056471 A164904 A083849
Adjacent sequences: A056467 A056468 A056469 this_sequence A056471 A056472 A056473
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
|
|
|
Search completed in 0.002 seconds
|
