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, three, four or five distinct values for every i,j,k<=n.
A211527
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, three, four or five distinct values for every i,j,k<=n.
Terms
- a(0) =8a(1) =18a(2) =42a(3) =90a(4) =192a(5) =394a(6) =806a(7) =1618a(8) =3244a(9) =6444a(10) =12798a(11) =25306a(12) =50056a(13) =98830a(14) =195252a(15) =385546a(16) =761880a(17) =1505776a(18) =2978372a(19) =5893812a(20) =11672100a(21) =23128778a(22) =45863610a(23) =91000330a(24) =180675314a(25) =358921836a(26) =713425574a(27) =1418791694a(28) =2822950098a(29) =5619290544
External references
- oeis: A211527