Array read by antidiagonals: a(n,k) = number of k-colorings of a circle of n nodes (n >= 1, k >= 1).
A106512
Array read by antidiagonals: a(n,k) = number of k-colorings of a circle of n nodes (n >= 1, k >= 1).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =0a(6) =0a(7) =6a(8) =0a(9) =0a(10) =0a(11) =12a(12) =6a(13) =2a(14) =0a(15) =0a(16) =20a(17) =24a(18) =18a(19) =0a(20) =0a(21) =0a(22) =30a(23) =60a(24) =84a(25) =30a(26) =2a(27) =0a(28) =0a(29) =42
External references
- oeis: A106512