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A321300
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Expansion of Product_{1 <= i < j} (1 - x^(i*j)).
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2
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1, 0, -1, -1, -1, 0, -1, 1, 1, 2, 2, 2, 0, 0, 2, -2, -1, -3, -1, -4, -4, -4, -1, -1, -2, 0, 3, 7, 3, 4, 5, 7, 5, 8, 3, 2, 4, 1, -6, -2, -8, -8, -12, -9, -9, -11, -13, -12, -6, -8, -6, -8, 11, 5, 6, 8, 18, 12, 22, 21, 28, 26, 28, 12, 21, 22, 11, 0, 0, -4, -18, -17, -38
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,10
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LINKS
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Seiichi Manyama, Table of n, a(n) for n = 0..10000
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FORMULA
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G.f.: Product_{k>0} (1 - x^k)^A056924(k).
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MATHEMATICA
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nmax = 100; CoefficientList[Series[Product[(1 - x^k)^Floor[DivisorSigma[0, k]/2], {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Nov 03 2018 *)
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CROSSREFS
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Convolution inverse of A321285.
Cf. A056924, A321286, A321299.
Sequence in context: A261119 A004541 A178045 * A037864 A285635 A181674
Adjacent sequences: A321297 A321298 A321299 * A321301 A321302 A321303
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KEYWORD
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sign,look
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AUTHOR
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Seiichi Manyama, Nov 03 2018
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STATUS
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approved
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