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

Terms

a(0) =0a(1) =3a(2) =9a(3) =21a(4) =42a(5) =72a(6) =114a(7) =171a(8) =243a(9) =333a(10) =444a(11) =576a(12) =732a(13) =915a(14) =1125a(15) =1365a(16) =1638a(17) =1944a(18) =2286a(19) =2667a(20) =3087a(21) =3549a(22) =4056a(23) =4608a(24) =5208a(25) =5859a(26) =6561a(27) =7317a(28) =8130a(29) =9000