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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). 8
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 (list; table; graph; refs; listen; history; text; internal format)
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

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Last modified January 20 14:40 EST 2019. Contains 319333 sequences. (Running on oeis4.)