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Search: id:A082505
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| 0, 1, 6, 12, 24, 48, 96, 192, 384, 768, 1536, 3072, 6144
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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If cototient is replaced by totient,analogous values are different: A053576.
Sequence is generated by the South-West direction of circles put around circle(s). See illustration. - Odimar Fabeny (aifab(AT)yahoo.com.br), Aug 09 2008
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LINKS
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Odimar Fabeny, Illustration for this sequence
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FORMULA
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Starting (1, 6, 12, 24, 48,...), = binomial transform of [1, 5, 1, 5, 1, 5,...]. - Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 18 2007
a(n+1)=Sum_{k, 0<=k<=n} A109466(n,k)*A144706(k). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 30 2008]
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EXAMPLE
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Apart from a[0]=0,a[1]=1 it equals A007283[n]=3.2^n.
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CROSSREFS
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Cf. A000010, A007283, A009195, A050339.
Cf. A134059.
Sequence in context: A063104 A090765 A160728 this_sequence A091629 A089529 A001766
Adjacent sequences: A082502 A082503 A082504 this_sequence A082506 A082507 A082508
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Apr 28 2003
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