Number of -3..3 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero.

A200425

Number of -3..3 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero.

Terms

    a(0) =92a(1) =520a(2) =2232a(3) =9898a(4) =50592a(5) =270848a(6) =1432402a(7) =7469120a(8) =38883992a(9) =203526914a(10) =1071337158a(11) =5658347658a(12) =29934599276a(13) =158560687098a(14) =841075030030

External references