Number of 4-ary Lyndon words of length n over Z_4 with trace 1 and subtrace 2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =11a(5) =32a(6) =128a(7) =512a(8) =1920a(9) =6963a(10) =24576a(11) =87380a(12) =317755a(13) =1179648a(14) =4438966a(15) =16777216a(16) =63406080a(17) =239541344a(18) =905969664a(19) =3435973836a(20) =13076666409a(21) =49928994816a(22) =191126044672a(23) =733007751680