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A105097
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Expansion of Delta(tau)/E_4(tau)^2.
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1
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1, -504, 180252, -56364992, 16415391870, -4574618335008, 1237162549543256, -327377686829760000, 85212608926827807477, -21894492009015306942480, 5567179862617316105012532, -1403483985988949037403977984
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OFFSET
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1,2
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COMMENTS
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According to Paşol and Zudilin, a(n) is divisible by n. - F. Chapoton, Aug 10 2021
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LINKS
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FORMULA
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PROG
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(PARI) {a(n)=if(n<1, 0, polcoeff( x*eta(x+x*O(x^n))^24/sum(k=1, n, 480*sigma(k, 7)*x^k, 1), n))} /* Michael Somos, Apr 07 2005 */
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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