Number of pairs {i,j}, i>1, j>1, such that ij < n^2.

Terms

a(0) =0a(1) =3a(2) =9a(3) =20a(4) =33a(5) =54a(6) =77a(7) =108a(8) =142a(9) =186a(10) =228a(11) =285a(12) =342a(13) =409a(14) =481a(15) =563a(16) =644a(17) =742a(18) =837a(19) =946a(20) =1060a(21) =1184a(22) =1308a(23) =1449a(24) =1592a(25) =1744a(26) =1903a(27) =2076a(28) =2240a(29) =2432