Number of (w,x,y,z) with all terms in {1,...,n} and w*x>3*y*z.

Terms

a(0) =0a(1) =0a(2) =1a(3) =6a(4) =32a(5) =100a(6) =219a(7) =441a(8) =797a(9) =1312a(10) =2061a(11) =3107a(12) =4451a(13) =6248a(14) =8526a(15) =11336a(16) =14823a(17) =19090a(18) =24122a(19) =30164a(20) =37253a(21) =45501a(22) =55091a(23) =66154a(24) =78663a(25) =92979a(26) =109170a(27) =127281a(28) =147629a(29) =170403