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Search: id:A141845
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| A141845 |
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a(n) = 5*a(n-1) + A047201(n), a(1) = 1. A047201 = numbers not divisible by 5: (1, 2, 3, 4, 6, 7, 8, 9, 11,...). |
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+0
1
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| 1, 7, 38, 194, 976, 4887, 24443, 122224, 611131, 3055667, 15278348, 76391754, 381958786, 1909793947, 9548969753, 47744848784, 238724243941, 1193621219727, 5968106098658, 29840530493314, 149202652466596, 746013262333007
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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G.f.: (1+x+x^2+x^3+x^4)/((1-x)^2(1+x)(1+x^2)(1-5x)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 06 2008]
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EXAMPLE
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a(4) = 194 = 5*a(3) + A047201(4) = 5*38 + 4.
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CROSSREFS
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Cf. A047201.
Sequence in context: A128726 A055146 A014827 this_sequence A048437 A099461 A104553
Adjacent sequences: A141842 A141843 A141844 this_sequence A141846 A141847 A141848
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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), Jul 11 2008
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EXTENSIONS
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Extended and corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 06 2008
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