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

Terms

a(0) =0a(1) =3a(2) =10a(3) =26a(4) =50a(5) =89a(6) =140a(7) =212a(8) =300a(9) =415a(10) =550a(11) =718a(12) =910a(13) =1141a(14) =1400a(15) =1704a(16) =2040a(17) =2427a(18) =2850a(19) =3330a(20) =3850a(21) =4433a(22) =5060a(23) =5756a(24) =6500a(25) =7319a(26) =8190a(27) =9142a(28) =10150a(29) =11245