Cubic polynomial coefficients such that an elliptical term is zero.

Terms

a(0) =3a(1) =2a(2) =12a(3) =16a(4) =27a(5) =54a(6) =48a(7) =128a(8) =75a(9) =250a(10) =108a(11) =432a(12) =147a(13) =686a(14) =192a(15) =1024a(16) =243a(17) =1458a(18) =300a(19) =2000a(20) =363a(21) =2662a(22) =432a(23) =3456a(24) =507a(25) =4394a(26) =588a(27) =5488a(28) =675a(29) =6750