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 two, three, four or five distinct values for every i,j,k<=n.
A211571
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 two, three, four or five distinct values for every i,j,k<=n.
Terms
- a(0) =24a(1) =60a(2) =136a(3) =278a(4) =564a(5) =1102a(6) =2160a(7) =4170a(8) =8084a(9) =15586a(10) =30160a(11) =58306a(12) =113060a(13) =219478a(14) =427124a(15) =832842a(16) =1627284a(17) =3186354a(18) =6249740a(19) =12283214a(20) =24175236a(21) =47665998a(22) =94090952a(23) =186015186a(24) =368095480a(25) =729323938a(26) =1446163736a(27) =2870526594a(28) =5701393800
External references
- oeis: A211571