OFFSET
0,4
COMMENTS
Sequence is identical to its third differences in absolute value.
LINKS
Index entries for linear recurrences with constant coefficients, signature (0, 3, 0, -3).
FORMULA
G.f.: (2*x^3-x^2-x+1)*(1+x)^2/(1-3*x^2+3*x^4). - R. J. Mathar, Jul 17 2009
MAPLE
MATHEMATICA
Join[{1, 1}, LinearRecurrence[{0, 3, 0, -3}, {1, 2, 3, 5}, 51]] (* Ray Chandler, Sep 23 2015 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Paul Curtz, Sep 29 2007
EXTENSIONS
More terms from R. J. Mathar, Oct 18 2007
STATUS
approved