Expansion of (theta_3(z)*theta_3(7z) + theta_2(z)*theta_2(7z))^4.

Terms

a(0) =1a(1) =8a(2) =40a(3) =128a(4) =328a(5) =656a(6) =1216a(7) =1864a(8) =2856a(9) =3560a(10) =5392a(11) =6368a(12) =9856a(13) =10640a(14) =17000a(15) =16832a(16) =22600a(17) =23760a(18) =32776a(19) =32576a(20) =43792a(21) =52864a(22) =57568a(23) =58560a(24) =78528a(25) =76024a(26) =94864a(27) =98432a(28) =137864a(29) =116720