Square array A(n,k) (n>=1, k>=1) read by antidiagonals: A(n,k) is the number of n-colorings of the Möbius ladder M_k on 2k vertices.
A277444
Square array A(n,k) (n>=1, k>=1) read by antidiagonals: A(n,k) is the number of n-colorings of the Möbius ladder M_k on 2k vertices.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =0a(4) =0a(5) =6a(6) =0a(7) =2a(8) =0a(9) =12a(10) =0a(11) =0a(12) =42a(13) =24a(14) =20a(15) =0a(16) =2a(17) =48a(18) =420a(19) =120a(20) =30a(21) =0a(22) =0a(23) =306a(24) =2160a(25) =2420a(26) =360a(27) =42a(28) =0a(29) =2
External references
- oeis: A277444