489753

Appears in sequences

• Fibonacci sequence beginning 5, 14.at n=23A022139
• Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and vertical height (i.e., number of rows) k (1 <= k <= n). A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=49A121692
• Number of quadrilaterals in a triangular matchstick arrangement of side n.at n=35A204185
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + n - 1, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=23A294367
• Number of deco polyominoes of height 2n and vertical height n.at n=5A374794