Number 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, six or seven distinct values for every i,j,k<=n.
A211582
Number 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, six or seven distinct values for every i,j,k<=n.
Terms
- a(0) =16a(1) =44a(2) =116a(3) =284a(4) =696a(5) =1672a(6) =3996a(7) =9580a(8) =22656a(9) =54456a(10) =128292a(11) =309676a(12) =729304a(13) =1768840a(14) =4171516a(15) =10165276a(16) =24024384a(17) =58797992a(18) =139284836a(19) =342197820a(20) =812420344a(21) =2002527128a(22) =4763655900a(23) =11774209164a(24) =28056237376a(25) =69503351704
External references
- oeis: A211582