|
Search: id:A130979
|
|
|
| A130979 |
|
G.f. : 7/(3+4*sqrt(1-28*x)). |
|
+0 5
|
|
| 1, 8, 120, 2192, 44248, 949488, 21237168, 489517344, 11544312984, 277190766896, 6753051796240, 166505875155936, 4146984734796016, 104174408364697952, 2636346768784492128, 67149645964991840832, 1720072455615130558488
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
Number of walks of length 2n on the 8-regular tree beginning and ending at some fixed vertex. Hankel transform is A135315. [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Feb 25 2009]
|
|
FORMULA
|
a(n) = Sum{k, 0<=k<=n}A039599(n,k)*7^(n-k). - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Aug 25 2007
|
|
CROSSREFS
|
Sequence in context: A165231 A004381 A166179 this_sequence A133308 A151834 A007762
Adjacent sequences: A130976 A130977 A130978 this_sequence A130980 A130981 A130982
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Aug 23 2007
|
|
EXTENSIONS
|
More terms from Olivier Gerard (Sep 22 2007).
|
|
|
Search completed in 0.002 seconds
|