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, four or six distinct values for every i,j,k<=n.
A211730
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, four or six distinct values for every i,j,k<=n.
Terms
- a(0) =48a(1) =238a(2) =714a(3) =1912a(4) =4946a(5) =12870a(6) =33484a(7) =89124a(8) =237726a(9) =649158a(10) =1771052a(11) =4937870a(12) =13708524a(13) =38836608a(14) =109246792a(15) =313321916a(16) =890240494a(17) =2577595902a(18) =7380219014a(19) =21526814774a(20) =62001807654a(21) =181885545056a(22) =526258853768
External references
- oeis: A211730