OFFSET
0,3
COMMENTS
Binomial transform of Jacobsthal(n)(1-(-1)^n)/2.
Starting with "1" = A001045 convolved with A025192: i.e., (1, 2, 6, 16, 46, ...) = (1, 1, 3, 5, 11, ...) * (1, 2, 6, 18, 54, ...). - Gary W. Adamson, May 10 2013
LINKS
Index entries for linear recurrences with constant coefficients, signature (4,-1,-6).
FORMULA
G.f.: x(1-2x-x^2)/((1+x)(1-2x)(1-3x))
a(n) = 3^n/6 - (-1)^n/6 + 2^n/6 - 0^n/6.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Apr 23 2004
STATUS
approved