Triangle with entry a(n,m) giving the number of necklaces of n beads (C_N symmetry) with n colors available for each bead, but only m distinct fixed colors, say c[1],...,c[m], are present, with m from {1,...,n} and n>=1.
A213934
Triangle with entry a(n,m) giving the number of necklaces of n beads (C_N symmetry) with n colors available for each bead, but only m distinct fixed colors, say c[1],...,c[m], are present, with m from {1,...,n} and n>=1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =1a(7) =3a(8) =3a(9) =6a(10) =1a(11) =3a(12) =10a(13) =12a(14) =24a(15) =1a(16) =8a(17) =31a(18) =50a(19) =60a(20) =120a(21) =1a(22) =9a(23) =71a(24) =180a(25) =300a(26) =360a(27) =720a(28) =1a(29) =22
External references
- oeis: A213934