Number of -n..n arrays x(0..2) of 3 elements with zero sum and no two neighbors equal.

Terms

a(0) =6a(1) =14a(2) =32a(3) =52a(4) =82a(5) =114a(6) =156a(7) =200a(8) =254a(9) =310a(10) =376a(11) =444a(12) =522a(13) =602a(14) =692a(15) =784a(16) =886a(17) =990a(18) =1104a(19) =1220a(20) =1346a(21) =1474a(22) =1612a(23) =1752a(24) =1902a(25) =2054a(26) =2216a(27) =2380a(28) =2554a(29) =2730