124173

Appears in sequences

• Number of orientable necklaces with 2n beads and two colors which when turned over produce their own color complement.at n=19A059078
• Triangle read by rows, T(n,k) = {n,k}*h(k), where {n,k} are the Stirling set numbers and h(k) = hypergeom([-k+1,-k],[],1), for n>=0 and 0<=k<=n.at n=40A256549