315900

Appears in sequences

• Number of nX3 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.at n=9A207421
• a(n) = 3^n + 6^n + 9^n + 12^n.at n=5A220442
• Triangle read by rows: T(n,k) is number of ways of arranging n indistinguishable points on an n X n square grid such that k rows contain at least one point.at n=17A258371