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Search: id:A144820
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| A144820 |
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Shifts left when Dirichlet convolution with a (DC:(b,a)->c) applied 6 times. |
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+0
2
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| 1, 1, 7, 49, 364, 2548, 18130, 126910, 890463, 6234270, 43655178, 305586246, 2139225879, 14974581153, 104822829531, 733759913733, 5136324781952, 35954273473664, 251679952469351, 1761759667285457, 12332317933624871
(list; graph; listen)
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OFFSET
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1,3
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LINKS
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N. J. A. Sloane, Transforms
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MAPLE
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with (numtheory): dc:= proc(b, c) proc(n) option remember; add (b(d) *c(n/d), d=`if`(n<0, {}, divisors(n))) end end: A:= proc(n, k) local a, b, t; b[1]:= dc(a, a); for t from 2 to k do b[t]:= dc(b[t-1], a) od: a:= n-> `if`(n=1, 1, b[k](n-1)); a(n) end: a:= n-> A(n, 6): seq (a(n), n=1..30);
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CROSSREFS
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6th column of A144324.
Sequence in context: A033143 A024582 A024587 this_sequence A090016 A005924 A145358
Adjacent sequences: A144817 A144818 A144819 this_sequence A144821 A144822 A144823
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KEYWORD
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eigen,nonn
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AUTHOR
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Alois P. Heinz (heinz(AT)hs-heilbronn.de), Sep 21 2008
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