20875

Appears in sequences

• Number of directed rooted trees with n nodes.at n=6A006964
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 45 ones.at n=0A031813
• a(n) = (3*n - 1)*(4*n - 1).at n=42A033578
• Row sums of triangle A091604.at n=22A091610
• Number of n X 5 binary arrays with every 1 having exactly three king-move neighbors equal to 1.at n=11A183452
• The least number with exactly n ones in the continued fraction of its square root.at n=45A206578
• Number A(n,k) of rooted trees with n nodes and k-colored non-root nodes; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=62A242249
• Number of partitions p of n such that min(p) <= (number of parts of p) < max(p).at n=40A325341