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A033770 Product t2(q^d); d | 11, where t2 = theta2(q)/(2*q^(1/4)). 1

%I

%S 1,1,0,1,0,0,1,0,0,0,1,1,1,0,1,1,0,1,0,0,0,2,0,0,0,0,1,0,1,0,0,0,1,1,

%T 1,0,2,0,0,2,0,0,0,1,0,1,0,1,1,0,0,0,0,0,1,1,1,0,0,0,0,1,0,0,0,0,3,1,

%U 0,2,0,0,1,0,0,0,1,1,2,0,0,1,0,0,0,0,0,1

%N Product t2(q^d); d | 11, where t2 = theta2(q)/(2*q^(1/4)).

%C Also the number of positive odd solutions to equation x^2 + 11*y^2 = 8*n + 12. - _Seiichi Manyama_, May 28 2017

%H Seiichi Manyama, <a href="/A033770/b033770.txt">Table of n, a(n) for n = 0..10000</a>

%t QP=QPochhammer; s=QP[q^2]^2 (QP[q^22]^2/(QP[q] QP[q^11]))+O[q]^105; CoefficientList[s, q] (* _Vincenzo Librandi_, May 30 2017 *)

%K nonn

%O 0,22

%A _N. J. A. Sloane_

%E More terms from _Seiichi Manyama_, May 22 2017

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Last modified August 9 05:12 EDT 2020. Contains 336319 sequences. (Running on oeis4.)