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A360002
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Expansion of Product_{k>=0} (1 - x^(k^2+5)) in powers of x.
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4
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1, 0, 0, 0, 0, -1, -1, 0, 0, -1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -1, 0, 1, 0, -1, 1, 1, -1, -1, 0, 0, -1, 0, 1, 1, 0, 0, 0, 1, -1, -2, 0, 0, -1, -1, 2, 1, 0, 0, 2, 1, -1, -1, -1, 0, -2, -1, 1, 2, -1, 0, 2, 1, -2, -1, 2, -1, -1, -1, 2, 0, 0, 0, 2, 1, -2, -1, 1, 0, -4, 0, 2
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OFFSET
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0,42
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LINKS
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PROG
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(PARI) my(N=100, x='x+O('x^N)); Vec(prod(k=0, sqrtint(N), 1-x^(k^2+5)))
(PARI) a_vector(n) = my(v=vector(n+1)); v[1]=1; for(i=1, n, v[i+1]=-sum(j=1, i, sumdiv(j, d, issquare(d-5)*d)*v[i-j+1])/i); v;
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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