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 one, two, three, four, five or six distinct values for every i,j,k<=n.
A211581
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 one, two, three, four, five or six distinct values for every i,j,k<=n.
Terms
- a(0) =25a(1) =125a(2) =457a(3) =1353a(4) =3771a(5) =10123a(6) =26785a(7) =70815a(8) =187485a(9) =501357a(10) =1349215a(11) =3674445a(12) =10074585a(13) =27914969a(14) =77778359a(15) =218513889a(16) =616455627a(17) =1749899177a(18) =4982262575a(19) =14249870589a(20) =40844847989a(21) =117464523359a(22) =338353979903a(23) =977015700789
External references
- oeis: A211581