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 A144321 Shifts left when Dirichlet convolution (DC:(b,b)->a) applied 7 times. 2

%I #8 Mar 30 2012 17:37:28

%S 1,1,128,16384,2105280,269475840,34494988288,4415358500864,

%T 565166154790272,72341267946323968,9259682331352899584,

%U 1185239338413171146752,151710635321300728430592,19418961321126493239115776,2485627049104751885136429056

%N Shifts left when Dirichlet convolution (DC:(b,b)->a) applied 7 times.

%H Alois P. Heinz, <a href="/A144321/b144321.txt">Table of n, a(n) for n = 1..150</a>

%H N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>

%p 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);

%Y 7th column of A144324.

%K eigen,nonn

%O 1,3

%A _Alois P. Heinz_, Sep 17 2008

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Last modified February 22 16:01 EST 2024. Contains 370256 sequences. (Running on oeis4.)