Number of matroids: column 3 of A034328.

A034333

Number of matroids: column 3 of A034328.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =3a(4) =6a(5) =12a(6) =20a(7) =33a(8) =52a(9) =78a(10) =113a(11) =163

External references