Smooth necklaces with 7 colors.

Terms

a(0) =1a(1) =7a(2) =13a(3) =24a(4) =55a(5) =126a(6) =330a(7) =836a(8) =2232a(9) =5926a(10) =15932a(11) =42849a(12) =116011a(13) =314375a(14) =854952a(15) =2329162a(16) =6359574a(17) =17393334a(18) =47653952a(19) =130752976a(20) =359275056a(21) =988458426a(22) =2722803495