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A133646
a(n)=5*a(n-1)+30*a(n-2) for n>=3, a(0)=1, a(1)=5, a(2)=50 .
2
1, 5, 50, 400, 3500, 29500, 252500, 2147500, 18312500, 155987500, 1329312500, 11326187500, 96510312500, 822337187500, 7006995312500, 59705092187500, 508735320312500, 4334829367187500, 36936206445312500, 314725913242187500
OFFSET
0,2
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
Sequence in context: A227261 A036291 A060347 * A043032 A247771 A125962
KEYWORD
easy,nonn
AUTHOR
Philippe Deléham, Dec 31 2007
STATUS
approved