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

Terms

a(0) =0a(1) =2a(2) =8a(3) =21a(4) =43a(5) =77a(6) =125a(7) =190a(8) =274a(9) =380a(10) =510a(11) =667a(12) =853a(13) =1071a(14) =1323a(15) =1612a(16) =1940a(17) =2310a(18) =2724a(19) =3185a(20) =3695a(21) =4257a(22) =4873a(23) =5546a(24) =6278a(25) =7072a(26) =7930a(27) =8855a(28) =9849a(29) =10915