127072

Appears in sequences

• Number of chord diagrams with n chords; number of pairings on a necklace.at n=8A007769
• Expansion of 1/(1-2*x-2*x^2+2*x^3).at n=13A077937
• Number of (w,x,y,z) with all terms in {1,...,n} and median<=mean.at n=22A212134
• Triangle read by rows: T(n,k) is the number of sensed combinatorial maps with n edges and k vertices, 1 <= k <= n + 1.at n=36A380615