193750

Appears in sequences

• Triangle by rows T(n,k), showing the number of meanders with length 5(n+1) and containing 5(k+1) L's and 5(n-k) R's, where L's and R's denote arcs of equal length and a central angle of 72 degrees which are positively or negatively oriented.at n=18A197654
• Number of ways to place 2 non-attacking wazirs on an n X n toroidal board.at n=24A201236
• Numbers k such that k' = concat(s,t) and k = s*t, where k' is the arithmetic derivative of k.at n=9A272780
• Triangle read by rows. T(n, k) = [x^k] lcm({i + 1 : 0 <= i <= n}) * (Sum_{u=0..k} ( Sum_{j=0..u} x^j * binomial(u, j) * (j + 1)^n ) / (u + 1)).at n=19A362995