849090domain: NAppears in sequencesMain diagonal of array A[k,n] = n-th sum of k consecutive k-gonal numbers, k>2.at n=28A130424Number of -2..2 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, four or six distinct values for every i,j,k<=n.at n=12A211575