Number of 4-ary Lyndon words of length n over Z_4 with trace 2 and subtrace 2.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =8a(5) =40a(6) =160a(7) =576a(8) =1920a(9) =6528a(10) =23040a(11) =84480a(12) =317440a(13) =1198080a(14) =4508328a(15) =16908288a(16) =63406080a(17) =238605640a(18) =902430720a(19) =3429236736a(20) =13076616480a(21) =49977753600a(22) =191312691200a(23) =733365665600