Number of matroids: column 4 of A034328.

A034334

Number of matroids: column 4 of A034328.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =4a(5) =11a(6) =26a(7) =58a(8) =121a(9) =240a(10) =454a(11) =835

External references