87732

Appears in sequences

• Triangle read by rows: T(n,k) is the number of deco polyominoes of height n with k cells in the second row (0<=k<=n-1; 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=42A134436
• a(n) = Sum_{k=0..n} binomial(k+5,5) * binomial(2*k,2*n-2*k).at n=7A382472