OFFSET
0,2
LINKS
FORMULA
G.f.: (1-5*x^2)/(1-5*x-30*x^2) . a(n) = Sum_{k, 0<=k<=n}A122950(n,k)*5^k .
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Philippe Deléham, Dec 31 2007
STATUS
approved