242978

Appears in sequences

• a(n) = [ 3rd elementary symmetric function of {sqrt(k)} ], k = 1,2,...,n.at n=28A025194
• Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,0 3,1 3,2 3,3 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155355