30812

Appears in sequences

• G.f.: 1/(1-x) = Sum_{n>=0} a(n)*x^n*Product_{k=1..n+1} (1-x^k).at n=31A209405
• Number of n X 5 arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..1 n X 5 array.at n=26A220029
• Number of defective 4-colorings of an n X 3 0..3 array connected horizontally, vertically, diagonally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..3 order.at n=10A229573
• Number of minimal complete rulers of length n.at n=26A325684
• Number of n-step self-avoiding walks on a 2D square lattice where the walk consists of three different units and each unit cannot be adjacent to another unit of the same type.at n=11A337441