T(2n+7,n), array T as in A051168; a count of Lyndon words.

Terms

a(0) =0a(1) =1a(2) =5a(3) =22a(4) =91a(5) =364a(6) =1428a(7) =5537a(8) =21318a(9) =81719a(10) =312455a(11) =1193010a(12) =4552275a(13) =17368680a(14) =66284554a(15) =253086480a(16) =966955410a(17) =3697182450a(18) =14147884842a(19) =54185826156a(20) =207712333598a(21) =796937116661