Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and -1<=w+2x+3y<=1.

Terms

a(0) =0a(1) =2a(2) =12a(3) =28a(4) =54a(5) =86a(6) =128a(7) =176a(8) =234a(9) =298a(10) =372a(11) =452a(12) =542a(13) =638a(14) =744a(15) =856a(16) =978a(17) =1106a(18) =1244a(19) =1388a(20) =1542a(21) =1702a(22) =1872a(23) =2048a(24) =2234a(25) =2426a(26) =2628a(27) =2836a(28) =3054a(29) =3278