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

Terms

a(0) =1a(1) =7a(2) =19a(3) =37a(4) =64a(5) =103a(6) =154a(7) =217a(8) =295a(9) =391a(10) =505a(11) =637a(12) =790a(13) =967a(14) =1168a(15) =1393a(16) =1645a(17) =1927a(18) =2239a(19) =2581a(20) =2956a(21) =3367a(22) =3814a(23) =4297a(24) =4819a(25) =5383a(26) =5989a(27) =6637a(28) =7330a(29) =8071