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 two, four or six distinct values for every i,j,k<=n.
A211574
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 two, four or six distinct values for every i,j,k<=n.
Terms
- a(0) =24a(1) =76a(2) =192a(3) =456a(4) =1046a(5) =2408a(6) =5458a(7) =12624a(8) =28762a(9) =67278a(10) =154580a(11) =365720a(12) =847122a(13) =2024242a(14) =4721206a(15) =11375392a(16) =26680354a(17) =64720018a(18) =152478042a(19) =371900846a(20) =879299028a(21) =2154128424a(22) =5107422788a(23) =12556963016a(24) =29839050584a(25) =73573746366
External references
- oeis: A211574