Number of ternary Lyndon words of length n with exactly two 1's.

Terms

a(0) =2a(1) =5a(2) =16a(3) =38a(4) =96a(5) =220a(6) =512a(7) =1144a(8) =2560a(9) =5616a(10) =12288a(11) =26592a(12) =57344a(13) =122816a(14) =262144a(15) =556928a(16) =1179648a(17) =2490112a(18) =5242880a(19) =11009536a(20) =23068672a(21) =48233472a(22) =100663296a(23) =209713152a(24) =436207616a(25) =905965568a(26) =1879048192a(27) =3892305920a(28) =8053063680a(29) =16642981888