Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and -1<=w+x+y<=1.

Terms

a(0) =0a(1) =6a(2) =24a(3) =60a(4) =114a(5) =186a(6) =276a(7) =384a(8) =510a(9) =654a(10) =816a(11) =996a(12) =1194a(13) =1410a(14) =1644a(15) =1896a(16) =2166a(17) =2454a(18) =2760a(19) =3084a(20) =3426a(21) =3786a(22) =4164a(23) =4560a(24) =4974a(25) =5406a(26) =5856a(27) =6324a(28) =6810a(29) =7314