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

Terms

a(0) =0a(1) =1a(2) =8a(3) =27a(4) =61a(5) =113a(6) =189a(7) =295a(8) =434a(9) =609a(10) =826a(11) =1091a(12) =1407a(13) =1777a(14) =2207a(15) =2703a(16) =3268a(17) =3905a(18) =4620a(19) =5419a(20) =6305a(21) =7281a(22) =8353a(23) =9527a(24) =10806a(25) =12193a(26) =13694a(27) =15315a(28) =17059a(29) =18929