Number of (w,x,y) with all terms in {0,...,n} and 2*|w-x| > max(w,x,y) - min(w,x,y).

Terms

a(0) =0a(1) =4a(2) =14a(3) =36a(4) =72a(5) =128a(6) =206a(7) =312a(8) =448a(9) =620a(10) =830a(11) =1084a(12) =1384a(13) =1736a(14) =2142a(15) =2608a(16) =3136a(17) =3732a(18) =4398a(19) =5140a(20) =5960a(21) =6864a(22) =7854a(23) =8936a(24) =10112a(25) =11388a(26) =12766a(27) =14252a(28) =15848a(29) =17560