205440

Appears in sequences

• Even legs of Pythagorean triangles whose other leg and hypotenuse are both prime.at n=24A067755
• Triangle T(n,k) read by rows, where T(n,k) = number of times the permanent of a real nonsingular n X n (0,1)-matrix takes the value k, for n >= 1, 1 <= k <= A000255(n).at n=28A089480
• G.f.: (1-4*x)^(-1/2) * (1-8*x)^(-1/4).at n=7A209200