Ulam numbers sandwiched between twin prime numbers.

Terms

a(0) =4a(1) =6a(2) =18a(3) =72a(4) =102a(5) =138a(6) =180a(7) =282a(8) =522a(9) =1020a(10) =1032a(11) =1230a(12) =1428a(13) =2112a(14) =2550a(15) =3390a(16) =3918a(17) =3930a(18) =4260a(19) =4800a(20) =5880a(21) =6552a(22) =6870a(23) =7950a(24) =9240a(25) =12162a(26) =13692a(27) =13758a(28) =14322a(29) =15138