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

Terms

a(0) =0a(1) =2a(2) =16a(3) =38a(4) =76a(5) =122a(6) =184a(7) =254a(8) =340a(9) =434a(10) =544a(11) =662a(12) =796a(13) =938a(14) =1096a(15) =1262a(16) =1444a(17) =1634a(18) =1840a(19) =2054a(20) =2284a(21) =2522a(22) =2776a(23) =3038a(24) =3316a(25) =3602a(26) =3904a(27) =4214a(28) =4540a(29) =4874