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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 . +0
3
1, 5, 50, 400, 3500, 29500, 252500, 2147500, 18312500, 155987500, 1329312500, 11326187500, 96510312500, 822337187500, 7006995312500, 59705092187500, 508735320312500, 4334829367187500, 36936206445312500, 314725913242187500 (list; graph; listen)
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: A064054 A036291 A060347 this_sequence A043032 A125962 A136915

Adjacent sequences: A133643 A133644 A133645 this_sequence A133647 A133648 A133649

KEYWORD

easy,nonn

AUTHOR

Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 31 2007

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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