Number of -3..3 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.
A211728
Number of -3..3 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) =36a(1) =154a(2) =448a(3) =1224a(4) =3228a(5) =8696a(6) =23292a(7) =64212a(8) =176272a(9) =496644a(10) =1389716a(11) =3979200a(12) =11286068a(13) =32691460a(14) =93606312a(15) =273411380a(16) =788182764a(17) =2316178480a(18) =6709685212a(19) =19804977492a(20) =57576268080a(21) =170502012884a(22) =496958379540
External references
- oeis: A211728