Number of triangle-free graphs on n vertices.

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =14a(5) =38a(6) =107a(7) =410a(8) =1897a(9) =12172a(10) =105071a(11) =1262180a(12) =20797002a(13) =467871369a(14) =14232552452a(15) =581460254001