Square array A(n,k), n>=1, k>=1, read by antidiagonals: A(n,k) is the number of n-colorings of the square diagonal grid graph DG_(k,k).

A212209

Square array A(n,k), n>=1, k>=1, read by antidiagonals: A(n,k) is the number of n-colorings of the square diagonal grid graph DG_(k,k).

Terms

    a(0) =1a(1) =0a(2) =2a(3) =0a(4) =0a(5) =3a(6) =0a(7) =0a(8) =0a(9) =4a(10) =0a(11) =0a(12) =0a(13) =24a(14) =5a(15) =0a(16) =0a(17) =0a(18) =72a(19) =120a(20) =6a(21) =0a(22) =0a(23) =0a(24) =168a(25) =6720a(26) =360a(27) =7a(28) =0a(29) =0

External references