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

Terms

a(0) =0a(1) =4a(2) =16a(3) =46a(4) =95a(5) =175a(6) =285a(7) =439a(8) =634a(9) =886a(10) =1190a(11) =1564a(12) =2001a(13) =2521a(14) =3115a(15) =3805a(16) =4580a(17) =5464a(18) =6444a(19) =7546a(20) =8755a(21) =10099a(22) =11561a(23) =13171a(24) =14910a(25) =16810a(26) =18850a(27) =21064a(28) =23429a(29) =25981