72080

Appears in sequences

• Number of -3..3 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having two, three or four distinct values for every i,j,k<=n.at n=12A211722
• Number of rooted labeled trees on n nodes such that every nonroot node is the child of a branching node or of the root.at n=8A254382