T(2n+3, n), array T as in A051168; a count of Lyndon words.

Terms

a(0) =0a(1) =1a(2) =3a(3) =9a(4) =30a(5) =99a(6) =333a(7) =1144a(8) =3978a(9) =13995a(10) =49742a(11) =178296a(12) =643842a(13) =2340135a(14) =8554275a(15) =31429026a(16) =115997970a(17) =429874830a(18) =1598952366a(19) =5967382200a(20) =22338765540a(21) =83859016527a(22) =315614844558