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A093949 Expansion of (q^5/12)eta(q^3)^5/eta(q) in powers of q. 0

%I #2 Apr 30 2014 01:34:22

%S 1,1,2,-2,0,-3,1,-5,-3,0,2,1,-3,1,5,0,5,5,2,0,-5,11,-3,-2,0,6,0,-7,

%T -13,0,-3,5,0,-10,0,-1,-6,0,-7,5,-7,6,7,-3,0,9,10,-7,0,0,1,9,5,6,0,0,

%U 19,-10,11,0,-6,-10,-7,-2,10,9,0,-2,-11,0,-11,-11,15,-7,0,-11,-6,-20,0,0,9,0,-3,0,0,-5,5,-2,1,-10,-7,14,0,-11

%N Expansion of (q^5/12)eta(q^3)^5/eta(q) in powers of q.

%C Euler transform of period 3 sequence [1,1,-4,...].

%C a(25n-10)=5a(n). a(5n)=0 unless n == 3 (mod 5).

%F G.f.: x Product_{k>0} (1-x^(3k))^5/(1-x^k).

%o (PARI) a(n)=local(X); if(n<1,0,X=x+x*O(x^n); n--; polcoeff(eta(X^3)^5/eta(X),n))

%K sign

%O 1,3

%A _Michael Somos_, Apr 18 2004

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