OFFSET
0,2
LINKS
FORMULA
G.f.: (1+6*x)/(1-x+49*x^2) .
a(n) = Sum_{k=0..n} A133607(n,k)*7^k. - Philippe Deléham, Dec 30 2007
MATHEMATICA
LinearRecurrence[{1, -49}, {1, 7}, 20] (* or *) CoefficientList[ Series[ (1+6x)/(1-x+49x^2), {x, 0, 20}], x] (* Harvey P. Dale, Sep 08 2018 *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Philippe Deléham, Dec 28 2007
EXTENSIONS
More terms from Harvey P. Dale, Sep 08 2018
STATUS
approved