171008

Appears in sequences

• Triangle of number of (weakly) connected unlabeled digraphs with n nodes and k arcs (n >=2, k >= 1).at n=56A054733
• Triangle T(n,k) of number of digraphs with a quasi-source on n unlabeled nodes and with k arcs, k = 0..n*(n-1).at n=62A057279
• Number of binary strings of length n with equal numbers of 00100 and 01001 substrings.at n=18A164236
• Expansion of (phi(-x^2) * phi(-x^4)^2 / phi(-x)^3)^2 in powers of x where phi() is a Ramanujan theta function.at n=8A258591
• Expansion of (phi(q^4) / phi(q))^2 in powers of q where phi() is a Ramanujan theta function.at n=16A260186
• Irregular triangular array read by rows: T(n,k) is the number of non-isomorphic unlabeled weakly connected digraphs on n nodes and with k arcs.at n=47A283753