Number of (w,x,y) with all terms in {0,...,n} and w>=range{w,x,y}.

Terms

a(0) =1a(1) =5a(2) =17a(3) =38a(4) =75a(5) =127a(6) =203a(7) =300a(8) =429a(9) =585a(10) =781a(11) =1010a(12) =1287a(13) =1603a(14) =1975a(15) =2392a(16) =2873a(17) =3405a(18) =4009a(19) =4670a(20) =5411a(21) =6215a(22) =7107a(23) =8068a(24) =9125a(25) =10257a(26) =11493a(27) =12810a(28) =14239a(29) =15755