Expansion of ( Sum_{k>=0} k*q^(k^2) )^4.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =0a(6) =0a(7) =8a(8) =0a(9) =0a(10) =24a(11) =0a(12) =12a(13) =32a(14) =0a(15) =72a(16) =16a(17) =0a(18) =144a(19) =16a(20) =54a(21) =96a(22) =96a(23) =216a(24) =0a(25) =192a(26) =216a(27) =144a(28) =256a(29) =0