Number of (w,x,y,z) with all terms in {1,...,n} and w^2>x*y*z.

Terms

a(0) =0a(1) =0a(2) =4a(3) =24a(4) =71a(5) =166a(6) =322a(7) =571a(8) =928a(9) =1403a(10) =2043a(11) =2875a(12) =3906a(13) =5183a(14) =6727a(15) =8584a(16) =10762a(17) =13303a(18) =16219a(19) =19601a(20) =23442a(21) =27766a(22) =32636a(23) =38080a(24) =44130a(25) =50771a(26) =58147a(27) =66243a(28) =75099a(29) =84768