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 four or six distinct values for every i,j,k<=n.
A211573
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 four or six distinct values for every i,j,k<=n.
Terms
- a(0) =16a(1) =44a(2) =108a(3) =260a(4) =604a(5) =1436a(6) =3324a(7) =7964a(8) =18556a(9) =44924a(10) =105468a(11) =257660a(12) =608764a(13) =1497596a(14) =3555324a(15) =8790524a(16) =20940796a(17) =51959804a(18) =124076028a(19) =308619260a(20) =738172924a(21) =1839144956a(22) =4403888124a(23) =10984562684a(24) =26322698236a(25) =65706098684a(26) =157533601788
External references
- oeis: A211573