1098752

Appears in sequences

• Number of -1..1 arrays x(0..n-1) of n elements with zero sum and no two neighbors equal.at n=21A199697
• Number of defective 4-colorings of an n X 2 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order.at n=7A229666
• T(n,k) = number of defective 4-colorings of an n X k 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order.at n=37A229672