Square array A(n,k) (n>=1, k>=1) read by antidiagonals: A(n,k) is the number of n-colorings of the prism graph Y_k on 2k vertices.
A277443
Square array A(n,k) (n>=1, k>=1) read by antidiagonals: A(n,k) is the number of n-colorings of the prism graph Y_k on 2k vertices.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =0a(6) =0a(7) =0a(8) =18a(9) =0a(10) =0a(11) =2a(12) =12a(13) =84a(14) =0a(15) =0a(16) =0a(17) =114a(18) =264a(19) =260a(20) =0a(21) =0a(22) =2a(23) =180a(24) =2652a(25) =1920a(26) =630a(27) =0a(28) =0a(29) =0
External references
- oeis: A277443