|
| |
|
|
A004292
|
|
Expansion of (1+x)^2/(1-18*x+x^2).
|
|
1
| |
|
|
1, 20, 360, 6460, 115920, 2080100, 37325880, 669785740, 12018817440, 215668928180, 3870021889800, 69444725088220, 1246135029698160, 22360985809478660, 401251609540917720, 7200167985927040300
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
REFERENCES
| J. M. Alonso, Growth functions of amalgams, in Alperin, ed., Arboreal Group Theory, Springer, pp. 1-34, esp. p. 32.
P. de la Harpe, Topics in Geometric Group Theory, Univ. Chicago Press, 2000, p. 160, middle display.
|
|
|
LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (18,-1).
|
|
|
CROSSREFS
| Pairwise sums of A049629.
Sequence in context: A093144 A156455 A089350 * A053508 A060918 A115100
Adjacent sequences: A004289 A004290 A004291 * A004293 A004294 A004295
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
|
| |
|
|
