OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (-1, -2, 0, -1, 1).
FORMULA
a(n) = -a(n-1) - 2a(n-2) - a(n-4) + a(n-5); a(0)=1, a(1)=1, a(2)=-6, a(3)=4, a(4)=7.
G.f.: (1 + 2x - 3x^2)/(1 + x + 2x^2 + x^4 - x^5).
MATHEMATICA
CoefficientList[Series[(1 + 2x - 3x^2)/(1 + x + 2x^2 + x^4 - x^5), {x, 0, 50}], x]
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Mario Catalani (mario.catalani(AT)unito.it), Sep 19 2002
STATUS
approved