7707033600

Appears in sequences

• Triangle giving a(n,k) = number of k-colored labeled graphs with n nodes.at n=25A046860
• a(n) is the denominator of 6 * Sum_{k=0..n} ((k+1)/(n-k+1)^2) * (Catalan(k)/(2^(2*k+1)))^2.at n=6A280723