Number of Lyndon-Bell strings of length n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =9a(5) =33a(6) =128a(7) =564a(8) =2681a(9) =13845a(10) =76661a(11) =453025a(12) =2839969a(13) =18805657a(14) =131020298a(15) =957267541a(16) =7313308052a(17) =58274257913a(18) =483216851547