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A144321 Shifts left when Dirichlet convolution (DC:(b,b)->a) applied 7 times. 2
1, 1, 128, 16384, 2105280, 269475840, 34494988288, 4415358500864, 565166154790272, 72341267946323968, 9259682331352899584, 1185239338413171146752, 151710635321300728430592, 19418961321126493239115776, 2485627049104751885136429056 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..150

N. J. A. Sloane, Transforms

MAPLE

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);

CROSSREFS

7th column of A144324.

Sequence in context: A297380 A283863 A223568 * A051251 A264346 A189958

Adjacent sequences:  A144318 A144319 A144320 * A144322 A144323 A144324

KEYWORD

eigen,nonn

AUTHOR

Alois P. Heinz, Sep 17 2008

STATUS

approved

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Last modified July 20 22:20 EDT 2019. Contains 325189 sequences. (Running on oeis4.)