Number of 4-ary Lyndon words of length n over Z_4 with trace 2 and subtrace 0.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =11a(5) =45a(6) =169a(7) =576a(8) =1948a(9) =6579a(10) =23133a(11) =84820a(12) =317755a(13) =1198665a(14) =4509419a(15) =16908288a(16) =63409935a(17) =238612920a(18) =902444517a(19) =3429289164a(20) =13076666409a(21) =49977848925a(22) =191312873561a(23) =733365665600