186996

Appears in sequences

• Number of permutations of an n X 4 array with each element moving exactly one horizontally or vertically and without 2-loops.at n=8A216796
• 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=69A216800
• Number of powerful uniform rooted trees with n nodes.at n=45A318689