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A321299 Expansion of Product_{1 <= i <= j} (1 - x^(i*j)). 5
1, -1, -1, 0, -1, 2, 0, 2, 0, -1, 2, -1, -2, 0, 0, -4, 0, -1, 1, 0, 2, 2, 2, -1, 3, -1, 1, 6, -2, 1, -6, 1, -4, 5, -7, -5, -1, -4, -2, 6, -4, 0, 0, -2, 13, -7, 8, 2, 5, 1, 10, 2, 9, -3, -1, -1, -6, -7, 2, -5, -8, 1, -6, -17, -4, 13, -8, 1, -16, -14, 3, 7, -1, 20, -10, 13, -3, 8 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

FORMULA

G.f.: Product_{k>0} (1 - x^k)^A038548(k).

MATHEMATICA

nmax = 100; CoefficientList[Series[Product[(1 - x^k)^Floor[(DivisorSigma[0, k] + 1)/2], {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Nov 03 2018 *)

CROSSREFS

Convolution inverse of A182269.

Cf. A038548, A211856, A321300.

Sequence in context: A029401 A086150 A105166 * A105783 A326819 A268189

Adjacent sequences:  A321296 A321297 A321298 * A321300 A321301 A321302

KEYWORD

sign,look

AUTHOR

Seiichi Manyama, Nov 03 2018

STATUS

approved

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Last modified January 20 08:54 EST 2022. Contains 350471 sequences. (Running on oeis4.)