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 four, five or six distinct values for every i,j,k<=n.
A211731
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 four, five or six distinct values for every i,j,k<=n.
Terms
- a(0) =36a(1) =170a(2) =532a(3) =1458a(4) =3800a(5) =10014a(6) =26052a(7) =70202a(8) =188180a(9) =522042a(10) =1439540a(11) =4085606a(12) =11496000a(13) =33144154a(14) =94513280a(15) =275391210a(16) =792226416a(17) =2325106662a(18) =6728275612a(19) =19846394074a(20) =57663996620a(21) =170698669690a(22) =497380837436
External references
- oeis: A211731