39704domain: NAppears in sequencesa(n) = A000676(n) - A000677(n).at n=22A100584Number 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 three, four, five, six or eight distinct values for every i,j,k<=n.at n=8A211592