A144320 Shifts left when Dirichlet convolution (DC:(b,b)->a) applied 6 times.

1, 1, 64, 4096, 264160, 16906240, 1082257408, 69264474112, 4432942899904, 283708353851392, 18157335711582208, 1162069485541261312, 74372447143871647744, 4759836617207785455616, 304629543505661931028480

Offset

1,3

Links

Table of n, a(n) for n=1..15.

N. J. A. Sloane, Transforms

Maple

k:=6: 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);

Crossrefs

6th column of A144324.

Sequence in context: A222934 A267994 A089357 * A324493 A324490 A262396

Adjacent sequences: A144317 A144318 A144319 * A144321 A144322 A144323

Keyword

eigen,nonn

Author

Alois P. Heinz, Sep 17 2008

Status

approved