Triangle T(n,k) (n >= 3, k = 1..n-2) read by rows, giving number of nonisomorphic oriented matroids with n points in n-k dimensions.
A063804
Triangle T(n,k) (n >= 3, k = 1..n-2) read by rows, giving number of nonisomorphic oriented matroids with n points in n-k dimensions.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =1a(4) =3a(5) =4a(6) =1a(7) =4a(8) =12a(9) =17a(10) =1a(11) =5a(12) =25a(13) =206a(14) =143a(15) =1a(16) =6a(17) =50a(18) =6029a(19) =181472a(20) =4890a(21) =1a(22) =7a(23) =91a(24) =508321
External references
- oeis: A063804