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

Terms

a(0) =0a(1) =3a(2) =6a(3) =16a(4) =25a(5) =46a(6) =64a(7) =100a(8) =130a(9) =185a(10) =230a(11) =308a(12) =371a(13) =476a(14) =560a(15) =696a(16) =804a(17) =975a(18) =1110a(19) =1320a(20) =1485a(21) =1738a(22) =1936a(23) =2236a(24) =2470a(25) =2821a(26) =3094a(27) =3500a(28) =3815a(29) =4280