346579

Appears in sequences

• a(n) = (4*n^2 + 2*n - 3)*(2*n - 1)*n/3.at n=19A058581
• Number of n-vertex, 2-edge multigraphs that are not nesting. Number of n-vertex, 2-edge multigraphs that are not crossing.at n=38A326278
• Numbers k such that 10^100000+k is prime.at n=1A365611