A144319 Shifts left when Dirichlet convolution (DC:(b,b)->a) applied 5 times.

1, 1, 32, 1024, 33264, 1064448, 34094080, 1091010560, 34913358688, 1117227985920, 35751328547328, 1144042513514496, 36609361521378304, 1171499568684105728, 37487986231712710656, 1199615559415862673408

Offset

1,3

Links

Table of n, a(n) for n=1..16.

N. J. A. Sloane, Transforms

Maple

k:=5: 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

5th column of A144324.

Sequence in context: A227593 A171306 A009976 * A041481 A158685 A265021

Adjacent sequences: A144316 A144317 A144318 * A144320 A144321 A144322

Keyword

eigen,nonn

Author

Alois P. Heinz, Sep 17 2008

Status

approved