OFFSET
0,4
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,3,-4,-4).
FORMULA
a(n)=sum{k=0..n, (2^(n-k)+2(-1)^(n-k))/3*(2^(k-1)-(-1)^k-1+3*0^k/20)}; a(n)=sum{k=0..n+1, A078008(n-k)binomial(n-k+1, k)binomial(1, (k+1)/2)(1-(-1)^k)/2}.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Oct 15 2004
STATUS
approved