Related to Zarankiewicz's problem.

Terms

a(0) =3a(1) =5a(2) =10a(3) =14a(4) =21a(5) =26a(6) =36a(7) =43a(8) =55a(9) =64a(10) =78a(11) =88a(12) =105a(13) =117a(14) =136a(15) =150a(16) =171a(17) =186a(18) =210a(19) =227a(20) =253a(21) =272a(22) =300a(23) =320a(24) =351a(25) =373a(26) =406a(27) =430a(28) =465a(29) =490