OFFSET
0,2
LINKS
FORMULA
a(n) = Sum_{k=0..n} A147703(n,k)*4^k.
G.f.: (1-2*x)/(1-7*x+5*x^2).
a(n) = ((29+3*sqrt(29))/58)*(3.5+0.5*sqrt(29))^n +((29-3*sqrt(29))/58)*(3.5-0.5*sqrt(29))^n. - Richard Choulet, Nov 20 2008 [corrected by Jason Yuen, Oct 04 2024]
MATHEMATICA
LinearRecurrence[{7, -5}, {1, 5}, 30] (* Harvey P. Dale, Oct 10 2015 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Nov 14 2008
STATUS
approved