Number of -4..4 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2).

A199905

Number of -4..4 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2).

Terms

    a(0) =1a(1) =6a(2) =42a(3) =152a(4) =804a(5) =5016a(6) =24864a(7) =139148a(8) =814776a(9) =4509164a(10) =25781576a(11) =149525280a(12) =856571710a(13) =4954153908a(14) =28801991844a(15) =167153096856a(16) =973462118580

External references