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

Terms

a(0) =0a(1) =6a(2) =42a(3) =102a(4) =192a(5) =312a(6) =462a(7) =642a(8) =852a(9) =1092a(10) =1362a(11) =1662a(12) =1992a(13) =2352a(14) =2742a(15) =3162a(16) =3612a(17) =4092a(18) =4602a(19) =5142a(20) =5712a(21) =6312a(22) =6942a(23) =7602a(24) =8292a(25) =9012a(26) =9762a(27) =10542a(28) =11352a(29) =12192