222304897

Properties

Appears in sequences

• Duplicate of A003436.at n=9A000858
• Number of inequivalent labeled Hamiltonian circuits on n-octahedron. Interlacing chords joining 2n points on circle.at n=10A003436
• (2*n+1)*a(n+1) = (4*n^2+1)*a(n) + (2*n+1)*a(n-1) with n>1, a(0)=2, a(1)=-1.at n=10A231622
• Number T(n,k) of labeled cyclic chord diagrams with n chords such that every chord has length at least k; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=46A324428
• Number of minimum edge covers in the n-cycle complement graph.at n=17A378862
• Prime numbersat n=12242533