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A067420 Fifth column of triangle A067417. +0
3
1, 7, 105, 1575, 23625, 354375, 5315625, 79734375, 1196015625, 17940234375, 269103515625, 4036552734375, 60548291015625, 908224365234375, 13623365478515625, 204350482177734375, 3065257232666015625 (list; graph; listen)
OFFSET

0,2

FORMULA

a(n)= A067417(n+4, 4). a(n)= 7*(3*5)^(n-1), n>=1, a(0)=1.

G.f.: (1-8*x)/(1-15*x).

CROSSREFS

Cf. A067419 (fourth column), A067421 (sixth column), A001024 (powers of 15).

Sequence in context: A093741 A139742 A120049 this_sequence A131869 A132867 A145666

Adjacent sequences: A067417 A067418 A067419 this_sequence A067421 A067422 A067423

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Jan 25 2002

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.


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