207408

Appears in sequences

• On an n X n grid, number of ways to draw arrows between adjacent nodes such that each node has one outgoing and one incoming arrow, of which the one is not the opposite of the other (i.e., without 2-loops).at n=5A216678
• Number of permutations of an nX6 array with each element moving exactly one horizontally or vertically and without 2-loops.at n=5A216798
• T(n,k)=Number of permutations of an nXk array with each element moving exactly one horizontally or vertically and without 2-loops.at n=60A216800