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) =4a(2) =20a(3) =54a(4) =109a(5) =191a(6) =309a(7) =469a(8) =674a(9) =930a(10) =1246a(11) =1628a(12) =2079a(13) =2605a(14) =3215a(15) =3915a(16) =4708a(17) =5600a(18) =6600a(19) =7714a(20) =8945a(21) =10299a(22) =11785a(23) =13409a(24) =15174a(25) =17086a(26) =19154a(27) =21384a(28) =23779a(29) =26345