7413705

Appears in sequences

• Sum of jump-lengths of all even trees with 2n edges.at n=9A127536
• Triangle read by rows: T(n,k) = number of connected matchings with n crossings and k chords, in a disk, k=2..n+1.at n=64A232223
• a(n) = binomial(9*n, n-9).at n=4A281580