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 one, two, three, four, five or six distinct values for every i,j,k<=n.

A211531

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 one, two, three, four, five or six distinct values for every i,j,k<=n.

Terms

    a(0) =9a(1) =27a(2) =77a(3) =199a(4) =503a(5) =1239a(6) =3021a(7) =7303a(8) =17583a(9) =42217a(10) =101245a(11) =242683a(12) =581751a(13) =1395031a(14) =3347035a(15) =8035199a(16) =19302063a(17) =46395265a(18) =111581119a(19) =268493349a(20) =646366887a(21) =1556696779a(22) =3750472401a(23) =9038662155a(24) =21789121821a(25) =52538282553a(26) =126706173657

External references