

A218026


Shifts 9 places left under Euler transform with a(0)=0 and a(n)=1 for n<9.


3



0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 5, 7, 11, 15, 22, 30, 42, 57, 80, 109, 152, 211, 296, 415, 588, 832, 1185, 1689, 2413, 3449, 4940, 7073, 10141, 14544, 20880, 29991, 43131, 62064, 89417, 128925, 186090, 268808, 388677, 562381, 814393, 1180070, 1711131
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OFFSET

0,12


LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000
N. J. A. Sloane, Transforms


FORMULA

G.f.: x + x^2 + x^3 + x^4 + x^5 + x^6 + x^7 + x^8 + x^9 / Product_{n>=1} (1  x^n)^a(n).  Ilya Gutkovskiy, May 08 2019


MAPLE

with(numtheory):
b:= proc(n) option remember; `if`(n=0, 1,
(add(add(d*a(d), d=divisors(j)) *b(nj), j=1..n))/n)
end:
a:= n> `if`(n<9, signum(n), b(n9)):
seq(a(n), n=0..60);


CROSSREFS

Column k=9 of A144018.
Cf. A316081.
Sequence in context: A218027 A241729 A084251 * A241728 A326589 A024794
Adjacent sequences: A218023 A218024 A218025 * A218027 A218028 A218029


KEYWORD

nonn,eigen


AUTHOR

Alois P. Heinz, Oct 18 2012


STATUS

approved



