OFFSET
0,3
COMMENTS
A Jacobsthal related sequence.
Inverse binomial transform of A084246.
LINKS
FORMULA
G.f.: (1+5*x)/((1+x)*(1+4*x)).
E.g.f.: (4*exp(-x) - exp(-4*x))/3.
a(n) = A084241(n) + (-1)^n
a(n) = (4*(-1)^n - (-4)^n)/3.
a(n) = (-1)^(n-1) * A080674(n-1). - Falk Hüffner, Jan 11 2021
MATHEMATICA
LinearRecurrence[{-5, -4}, {1, 0}, 30] (* Harvey P. Dale, Dec 13 2021 *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Paul Barry, May 23 2003
STATUS
approved