|
| |
|
|
A141148
|
|
Number of aperiodic ternary necklaces with n berds of each color and no adjacent berds of the same color.
|
|
2
| |
|
|
2, 3, 14, 65, 346, 1929, 11442, 70310, 445928, 2896239, 19186738, 129184583, 881808726, 6089840427, 42482905678, 298976072384, 2120377458898, 15141288786096, 108784152585234, 785869928763325, 5705406374237814
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
LINKS
| L. Q. Eifler, K. B. Reid Jr., D. P. Roselle, Sequences with adjacent elements unequal, Aequationes Mathematicae 6 (2-3), 1971.
Max Alekseyev, PARI scripts for various problems
|
|
|
FORMULA
| a(n) = Sum[d|n] moebius(n/d) * A141147(d) / n
|
|
|
CROSSREFS
| Cf. A110706, A110707, A110710, A110711, A141146, A141147.
Sequence in context: A128849 A153741 A070207 * A064184 A203761 A154750
Adjacent sequences: A141145 A141146 A141147 * A141149 A141150 A141151
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Max Alekseyev (maxale(AT)gmail.com), Jun 10 2008
|
| |
|
|
