918225

Appears in sequences

• Triangular array read by rows: T(n, k) = S(n, [n/2]-k) and S(n,k) = C(n, 2*k)*(2*k-1)!!*((2*k-1)!! + 1)/2, n>=0, 0<=k<=[n/2].at n=37A246257
• Number of chordless cycles (of length >=4) in the complement of the n-odd graph.at n=5A364993