T(n,k) = Number of n X k nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, vertical or antidiagonal neighbor (colorings ignoring permutations of colors).

A208054

T(n,k) = Number of n X k nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, vertical or antidiagonal neighbor (colorings ignoring permutations of colors).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =2a(6) =5a(7) =15a(8) =15a(9) =5a(10) =15a(11) =203a(12) =716a(13) =203a(14) =15a(15) =52a(16) =4140a(17) =83440a(18) =83440a(19) =4140a(20) =52a(21) =203a(22) =115975a(23) =18171918a(24) =112073062a(25) =18171918a(26) =115975a(27) =203a(28) =877a(29) =4213597

External references