62570

Appears in sequences

• The number of edges in a graph induced by a regular drawing of K_{n,n}.at n=21A290132
• Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=15A318346
• Triangle read by rows: T(n,k) is the number of free polyforms consisting of k unit square cells and n-k isosceles right triangular cells whose short sides have unit length. Cells are joined along sides of equal lengths.at n=40A391193