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A262310 a(n) = coefficient of x^(2n) in the expansion of the modular form Product_{k>=1} (1-x^k)^n. 2

%I

%S 1,-1,1,-7,9,9,49,-176,57,-673,2401,1143,-9063,33201,-153502,315783,

%T -755943,2210985,-767039,1790369,-40127031,44496424,-58813391,

%U 1040502519,-1696965207,-1810005816,-4483997699,7445790947,105920054242,-134133273672,-203398909151

%N a(n) = coefficient of x^(2n) in the expansion of the modular form Product_{k>=1} (1-x^k)^n.

%p C7:=proc(r) local t1,n;

%p t1:=mul((1-x^n)^r,n=1..2*r+2);

%p series(t1,x,2*r+1);

%p coeff(%,x,2*r);

%p end;

%p [seq(C7(i),i=0..30)];

%Y Bisections: A262537, A262538.

%K sign

%O 0,4

%A _N. J. A. Sloane_, Oct 04 2015

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Last modified September 21 11:44 EDT 2019. Contains 327253 sequences. (Running on oeis4.)