Number of (w,x,y) with all terms in {0,...,n} and max(w,x,y) < 2*min(w,x,y).

Terms

a(0) =0a(1) =1a(2) =2a(3) =9a(4) =16a(5) =35a(6) =54a(7) =91a(8) =128a(9) =189a(10) =250a(11) =341a(12) =432a(13) =559a(14) =686a(15) =855a(16) =1024a(17) =1241a(18) =1458a(19) =1729a(20) =2000a(21) =2331a(22) =2662a(23) =3059a(24) =3456a(25) =3925a(26) =4394a(27) =4941a(28) =5488a(29) =6119