Number of (w,x,y) with all terms in {0,...,n} and w>floor((x+y)/3).

Terms

a(0) =0a(1) =4a(2) =15a(3) =37a(4) =75a(5) =132a(6) =212a(7) =320a(8) =459a(9) =633a(10) =847a(11) =1104a(12) =1408a(13) =1764a(14) =2175a(15) =2645a(16) =3179a(17) =3780a(18) =4452a(19) =5200a(20) =6027a(21) =6937a(22) =7935a(23) =9024a(24) =10208a(25) =11492a(26) =12879a(27) =14373a(28) =15979a(29) =17700