271210

Appears in sequences

• Number of n-covers of an unlabeled 3-set.at n=21A005745
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 1), (0, 1, -1), (1, 0, 1)}.at n=12A148671
• Wiener index of graphs of f.c.c. unit cells in a line = Sum of distances in face-centered cubic grid unit cells connected in a row.at n=20A273322