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 one, two, three, four, six or seven distinct values for every i,j,k<=n.
A211741
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 one, two, three, four, six or seven distinct values for every i,j,k<=n.
Terms
- a(0) =49a(1) =239a(2) =815a(3) =2425a(4) =6901a(5) =19179a(6) =52773a(7) =145469a(8) =400713a(9) =1115601a(10) =3110323a(11) =8788819a(12) =24852989a(13) =71239929a(14) =204020245a(15) =591763945a(16) =1711883257a(17) =5010260001a(18) =14603694017a(19) =43023663753a(20) =126092893931a(21) =373234182183
External references
- oeis: A211741