OFFSET
1,6
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..1000
Index entries for linear recurrences with constant coefficients, signature (0, 0, 7, 0, 0, 1, 0, 0, 1).
FORMULA
a(n) = A134720(n)/2.
Empirical g.f.: -x^4*(x^4-x^3+2*x^2+x+1) / (x^9+x^6+7*x^3-1). - Colin Barker, Sep 18 2013
MATHEMATICA
#/2&/@Select[Join[{0, 0, 0}, LinearRecurrence[{0, 1, 1}, {1, 1, 1}, 100]], EvenQ] (* Harvey P. Dale, May 11 2011 *)
LinearRecurrence[{0, 0, 7, 0, 0, 1, 0, 0, 1}, {0, 0, 0, 1, 1, 2, 6, 8, 14}, 40] (* Ray Chandler, Mar 03 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Feb 17 2008
EXTENSIONS
More terms from Harvey P. Dale, May 11 2011
STATUS
approved