OFFSET
0,6
COMMENTS
Binomial transform is A099530.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (-3,-3,-1,-1).
FORMULA
a(n)=-3a(n-1)-3a(n-2)-a(n-3)-a(n-4); a(n)=sum{j=0..n, sum{k=0..floor(j/4), C(n, j)(-1)^(n-j)C(j-3k, k)(-1)^k}}.
MATHEMATICA
CoefficientList[Series[(1+x)^3/((1+x)^3+x^4), {x, 0, 50}], x] (* or *) LinearRecurrence[{-3, -3, -1, -1}, {1, 0, 0, 0}, 50] (* Harvey P. Dale, Feb 21 2016 *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Paul Barry, Oct 20 2004
STATUS
approved