47913

Appears in sequences

• Number of weakly connected digraphs with n arcs.at n=8A053454
• G.f.: A(x) = (1-sqrt(1-4*x))/2 o x/(1-x) o (x-x^2), a composition of functions involving the Catalan function and its inverse.at n=12A120010
• Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,2,1,0,4 for x=0,1,2,3,4.at n=10A196976