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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
OFFSET
0,6
LINKS
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.
Sequence in context: A029401 A086150 A105166 * A105783 A326819 A268189
KEYWORD
sign,look
AUTHOR
Seiichi Manyama, Nov 03 2018
STATUS
approved