Number of (w,x,y) with all terms in {0,...,n} and the numbers w,x,y,|w-x|,|x-y|,|y-w| distinct.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =12a(7) =48a(8) =96a(9) =204a(10) =300a(11) =480a(12) =684a(13) =972a(14) =1260a(15) =1692a(16) =2124a(17) =2700a(18) =3288a(19) =4044a(20) =4812a(21) =5784a(22) =6744a(23) =7932a(24) =9144a(25) =10584a(26) =12024a(27) =13752a(28) =15480a(29) =17496