20824778

Appears in sequences

• Number of permutations of n copies of 1..3 introduced in order 1..3 with no element equal to another within a distance of 1.at n=10A190917
• Number of nX1 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and no element equal to any horizontal or vertical neighbor.at n=29A199126
• Number of permutations of 10 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 1.at n=3A321670