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A005053 Expand (1-2x)/(1-5x). +0
3
1, 3, 15, 75, 375, 1875, 9375, 46875, 234375, 1171875, 5859375, 29296875, 146484375, 732421875, 3662109375, 18310546875, 91552734375, 457763671875, 2288818359375, 11444091796875, 57220458984375 (list; graph; listen)
OFFSET

0,2

LINKS

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 883

FORMULA

3*5^n.

Binomial transform of A122117 . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 19 2006

a(0)=1, a(n)=3*5^(n-1) for n>=1 . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 19 2006

CROSSREFS

Sequence in context: A007142 A063000 A002902 this_sequence A136778 A000266 A059838

Adjacent sequences: A005050 A005051 A005052 this_sequence A005054 A005055 A005056

KEYWORD

nonn,easy

AUTHOR

njas

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.


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