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Search: id:A144321
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| A144321 |
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Shifts left when Dirichlet convolution (DC:(b,b)->a) applied 7 times. |
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+0
2
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| 1, 1, 128, 16384, 2105280, 269475840, 34494988288, 4415358500864, 565166154790272, 72341267946323968, 9259682331352899584, 1185239338413171146752, 151710635321300728430592
(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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k:=7: 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:='a': b[1]:= dc(a, a): for t from 2 to k do b[t]:= dc(b[t-1], b[t-1]) od: a:= n-> `if`(n=1, 1, b[k](n-1)): seq (a(n), n=1..25);
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CROSSREFS
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7th column of A144324.
Sequence in context: A001661 A093532 A016747 this_sequence A051251 A067822 A013996
Adjacent sequences: A144318 A144319 A144320 this_sequence A144322 A144323 A144324
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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 17 2008
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