175416

Appears in sequences

• Triangle read by rows: T(n,k) is the number of strongly connected directed multigraphs with loops, with n arcs and k vertices.at n=61A139622
• O.g.f. A(x,y) satisfies: [x^n] exp( n * x*A(x,y) ) * (n + y - A(x,y)) = 0 for n > 0.at n=21A305109
• O.g.f. A(x) satisfies: [x^n] exp( n * x*A(x) ) * (n - A(x)) = 0 for n >= 0.at n=6A305111
• Number of bracelets (turnover necklaces) of length n that have no reflection symmetry and consist of 6 white beads and n-6 black beads.at n=42A308401