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Search: id:A144821
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| A144821 |
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Shifts left when Dirichlet convolution with a (DC:(b,a)->c) applied 8 times. |
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+0
2
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| 1, 1, 9, 81, 765, 6885, 62613, 563517, 5077569, 45701037, 411364413, 3702279717, 33321067929, 299889611361, 2699011010385, 24291099589185, 218619937132623, 1967579434193607, 17708215277809323, 159373937500283907
(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, 8): seq (a(n), n=1..30);
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CROSSREFS
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8th column of A144324.
Sequence in context: A033145 A158762 A101601 this_sequence A137062 A001514 A077364
Adjacent sequences: A144818 A144819 A144820 this_sequence A144822 A144823 A144824
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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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