Number of ternary Lyndon words with exactly three 1's.

Terms

a(0) =2a(1) =8a(2) =26a(3) =80a(4) =224a(5) =596a(6) =1536a(7) =3840a(8) =9384a(9) =22528a(10) =53248a(11) =124240a(12) =286720a(13) =655360a(14) =1485472a(15) =3342336a(16) =7471104a(17) =16602432a(18) =36700160a(19) =80740352a(20) =176859776a(21) =385875968a(22) =838860800a(23) =1817531648a(24) =3925868544a(25) =8455716864a(26) =18164132352a(27) =38923141120