The number of Lyndon words of size n from an alphabet of 4 letters and 1st, 2nd and 3rd letter of the alphabet with equal frequency in the words.

A349002

The number of Lyndon words of size n from an alphabet of 4 letters and 1st, 2nd and 3rd letter of the alphabet with equal frequency in the words.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =2a(4) =6a(5) =12a(6) =34a(7) =120a(8) =354a(9) =1082a(10) =3636a(11) =12270a(12) =40708a(13) =139062a(14) =484866a(15) =1692268a(16) =5944470a(17) =21134808a(18) =75625330a(19) =271720146a(20) =982116648a(21) =3569558058a(22) =13025614962a(23) =47714385708a(24) =175470892468a(25) =647508620070

External references