a(n) is twice the least possible area enclosed by a convex lattice n-gon.

Terms

a(0) =1a(1) =2a(2) =5a(3) =6a(4) =13a(5) =14a(6) =21a(7) =28a(8) =43a(9) =48a(10) =65a(11) =80a(12) =103a(13) =118a(14) =151a(15) =174a(16) =213a(17) =242a(18) =289a(19) =328a(20) =387a(21) =420a(22) =497a(23) =548a(24) =625a(25) =690a(26) =783a(27) =860a(28) =967a(29) =1046