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

Terms

a(0) =1a(1) =7a(2) =25a(3) =55a(4) =109a(5) =181a(6) =289a(7) =421a(8) =601a(9) =811a(10) =1081a(11) =1387a(12) =1765a(13) =2185a(14) =2689a(15) =3241a(16) =3889a(17) =4591a(18) =5401a(19) =6271a(20) =7261a(21) =8317a(22) =9505a(23) =10765a(24) =12169a(25) =13651a(26) =15289a(27) =17011a(28) =18901a(29) =20881