Number of symmetry classes of 3 X 3 semimagic squares with distinct positive values < n.

Terms

a(0) =1a(1) =4a(2) =13a(3) =36a(4) =80a(5) =160a(6) =291a(7) =496a(8) =794a(9) =1226a(10) =1821a(11) =2632a(12) =3691a(13) =5080a(14) =6840a(15) =9070a(16) =11826a(17) =15228a(18) =19344a(19) =24332a(20) =30262a(21) =37322a(22) =45606a(23) =55330a(24) =66597a(25) =79674a(26) =94673a(27) =111892a(28) =131474a(29) =153756