Concatenate the terms of three copies of the Fibonacci sequence.

Terms

a(0) =0a(1) =111a(2) =111a(3) =222a(4) =333a(5) =555a(6) =888a(7) =131313a(8) =212121a(9) =343434a(10) =555555a(11) =898989a(12) =144144144a(13) =233233233a(14) =377377377a(15) =610610610a(16) =987987987a(17) =159715971597a(18) =258425842584a(19) =418141814181a(20) =676567656765