1219497

Appears in sequences

• 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, 0, 0), (0, 0, 1), (1, -1, 1), (1, 1, -1), (1, 1, 0)}.at n=10A150656
• Number of irredundant sets in the n-dipyramidal graph.at n=23A297712
• G.f. A(x) satisfies: A(x) = 1 + x + x^2 * A(x/(1 - x)) / (1 - x)^3.at n=13A351438