Square array A(n,k), n>=1, k>=1, read by antidiagonals: A(n,k) is the number of n-colorings of the rhombic hexagonal square grid graph RH_(k,k).
A212163
Square array A(n,k), n>=1, k>=1, read by antidiagonals: A(n,k) is the number of n-colorings of the rhombic hexagonal square grid graph RH_(k,k).
Terms
- a(0) =1a(1) =0a(2) =2a(3) =0a(4) =0a(5) =3a(6) =0a(7) =0a(8) =6a(9) =4a(10) =0a(11) =0a(12) =6a(13) =48a(14) =5a(15) =0a(16) =0a(17) =6a(18) =1056a(19) =180a(20) =6a(21) =0a(22) =0a(23) =6a(24) =45696a(25) =32940a(26) =480a(27) =7a(28) =0a(29) =0
External references
- oeis: A212163