Number of nonisomorphic oriented matroids with n points in 2 dimensions.

A063800

Number of nonisomorphic oriented matroids with n points in 2 dimensions.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =17a(4) =143a(5) =4890a(6) =461053a(7) =95052532

External references