OFFSET
0,2
LINKS
FORMULA
G.f.: (1-x-x^2)/(1-7*x-x^2).
a(n) = Sum_{k, 0<=k<=n} A155161(n,k)*6^k. - Philippe Deléham, Feb 08 2012
MATHEMATICA
Join[{1}, LinearRecurrence[{7, 1}, {6, 42}, 20]] (* Harvey P. Dale, Sep 04 2014 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Jan 21 2009
STATUS
approved