OFFSET
0,2
REFERENCES
F. Albert Cotton, Chemical Applications of Group Theory, Wiley-Interscience; 3 edition (March 2, 1990).
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Martin Burtscher, Igor Szczyrba, Rafał Szczyrba, Analytic Representations of the n-anacci Constants and Generalizations Thereof, Journal of Integer Sequences, Vol. 18 (2015), Article 15.4.5.
Tanya Khovanova, Recursive Sequences
Index entries for linear recurrences with constant coefficients, signature (2,2).
FORMULA
From Philippe Deléham, Nov 19 2008: (Start)
a(n) = 4*A002605(n).
G.f.: 4x/(1-2x-2x^2). (End)
E.g.f.: (4/sqrt(3))*exp(x)*sinh(sqrt(3)*x). - G. C. Greubel, Oct 31 2016
MATHEMATICA
LinearRecurrence[{2, 2}, {0, 4}, 25] (* or *) Table[(2/sqrt(3))*( [1+sqrt(3)]^n - [1-sqrt(3)]^n ) , {n, 0, 25}] (* G. C. Greubel, Oct 31 2016 *)
CROSSREFS
KEYWORD
nonn,easy,less
AUTHOR
Roger L. Bagula, Mar 15 2006
EXTENSIONS
Edited by N. J. A. Sloane, Dec 04 2006
STATUS
approved