Starting from generation 4 add previous and next term yielding generation 5.

Terms

a(0) =30a(1) =56a(2) =97a(3) =125a(4) =179a(5) =214a(6) =274a(7) =326a(8) =382a(9) =454a(10) =506a(11) =582a(12) =640a(13) =708a(14) =780a(15) =842a(16) =924a(17) =984a(18) =1060a(19) =1128a(20) =1194a(21) =1276a(22) =1348a(23) =1432a(24) =1508a(25) =1582a(26) =1652a(27) =1718a(28) =1808a(29) =1870