OFFSET
0,2
COMMENTS
Partial sums of A097788.
LINKS
Index entries for linear recurrences with constant coefficients, signature (9,-30,50,-45,21,-4).
FORMULA
G.f. : 1/((1-4x)(1-x)^5); a(n)=4^(n + 5)/243-(27n^4+414n^3+2385n^2+6198n+6248)/1944; a(n)=sum{k=0..n, binomial(n+5, k+5)3^k}.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Aug 24 2004
STATUS
approved