8450649

Appears in sequences

• Let df(n,k) = Product_{i=0..k-1} (n-i) be the descending factorial and let P(m,n) = df(n-1,m-1)^2*(2*n-m)/((m-1)!*m!). Sequence gives P(4,n).at n=19A132458
• Smallest number expressible in the form a^2 + 2b^2, with positive integers a and b, in exactly n ways.at n=21A200977
• Number of ways to place the maximal number of points that can be placed on a j X j X j triangular grid, j=3n-2, so that no pair of them has distance sqrt(3).at n=5A244506
• Number of maximum independent vertex sets in the n-triangular honeycomb grid graph.at n=15A297537