The (12^n)-th composite number.

Terms

a(0) =4a(1) =21a(2) =187a(3) =2037a(4) =23340a(5) =272696a(6) =3217385a(7) =38159996a(8) =454037291a(9) =5413203476a(10) =64627581335a(11) =772339921008