Number of n-bead necklace structures using a maximum of four different colored beads.

A056292

Number of n-bead necklace structures using a maximum of four different colored beads.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =7a(4) =11a(5) =39a(6) =103a(7) =367a(8) =1235a(9) =4439a(10) =15935a(11) =58509a(12) =215251a(13) =799697a(14) =2983217a(15) =11187567a(16) =42109451a(17) =159082753a(18) =602809327a(19) =2290684251a(20) =8726308317a(21) =33318661277a(22) =127479700199a(23) =488672302909

External references