A034328 Triangle read by rows: T(n,k) = number of loopless, regular k X n-matrix matroids of dimension k (or n-matroids of rank k).

1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 6, 4, 1, 1, 6, 12, 11, 5, 1, 1, 7, 20, 26, 17, 6, 1, 1, 9, 33, 58, 52, 25, 7, 1, 1, 11, 52, 121, 146, 95, 35, 8, 1, 1, 13, 78, 240, 388, 334, 162, 47, 9, 1, 1, 15, 113, 454, 975, 1123, 710, 262, 61, 10, 1, 1, 18, 163, 835, 2365

Offset

0,5

References

Computed by Harald Fripertinger (fripert(AT)kfunigraz.ac.at).

Links

Table of n, a(n) for n=0..70.

H. Fripertinger, Isometry Classes of Codes

Index entries for sequences related to binary linear codes

Index entries for sequences related to matroids

Example

1; 1,1; 1,2,1; 1,3,3,1; 1,4,6,4,1; 1,6,12,11,5,1; 1,7,20,26,17,6,1; ...

Crossrefs

Cf. A034356, A034327.

Sequence in context: A230860 A051137 A183328 * A034253 A203952 A296115

Adjacent sequences: A034325 A034326 A034327 * A034329 A034330 A034331

Keyword

nonn,tabl

Author

N. J. A. Sloane.

Extensions

Description corrected by Harald Fripertinger, Nov 14 2007

Status

approved