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Search: id:A135092
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| A135092 |
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Binomial transform of [1, 6, 1, 6, 1, 6,...]. |
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+0
3
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| 1, 7, 14, 28, 56, 112, 224, 448, 896, 1792, 3584, 7168, 14336, 28672, 57344, 114688, 229376, 458752, 917504, 1835008, 3670016, 7340032, 14680064, 29360128, 58720256, 117440512, 234881024, 469762048, 939524096, 1879048192, 3758096384, 7516192768, 15032385536
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(0) = 1, then a(n), n>0 = 7*2^(n-1).
a(n) = Sum_{k, 0<=k<=n}A097805(n,k)*7^k*(-5)^(n-k) . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 19 2007
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EXAMPLE
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a(3) = (1, 3, 3, 1) dot (1, 6, 1, 6) = (1 + 18 + 3 + 6).
a(3) = 28 = 7*2^2
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CROSSREFS
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Essentially identical to A005009.
Sequence in context: A033895 A115876 A005009 this_sequence A058530 A134384 A084382
Adjacent sequences: A135089 A135090 A135091 this_sequence A135093 A135094 A135095
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 18 2007
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EXTENSIONS
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Corrected and extended by Philippe DELEHAM and N. J. A. Sloane (njas(AT)research.att.com), Dec 15 2007
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