Number of -1..1 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, five or six distinct values for every i,j,k<=n.
A211529
Number of -1..1 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, five or six distinct values for every i,j,k<=n.
Terms
- a(0) =8a(1) =22a(2) =42a(3) =80a(4) =140a(5) =254a(6) =448a(7) =820a(8) =1490a(9) =2788a(10) =5220a(11) =9974a(12) =19112a(13) =37100a(14) =72226a(15) =141724a(16) =278732a(17) =550774a(18) =1090128a(19) =2163668a(20) =4299314a(21) =8557076a(22) =17044564a(23) =33984118a(24) =67793624a(25) =135319900a(26) =270197826a(27) =539710892a(28) =1078295036a(29) =2154827702
External references
- oeis: A211529