Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+x+y>0.

Terms

a(0) =0a(1) =4a(2) =29a(3) =99a(4) =238a(5) =470a(6) =819a(7) =1309a(8) =1964a(9) =2808a(10) =3865a(11) =5159a(12) =6714a(13) =8554a(14) =10703a(15) =13185a(16) =16024a(17) =19244a(18) =22869a(19) =26923a(20) =31430a(21) =36414a(22) =41899a(23) =47909a(24) =54468a(25) =61600a(26) =69329a(27) =77679a(28) =86674a(29) =96338