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A076834 Number of inequivalent projective binary linear [n,k] codes of any dimension k <= n. Also the number of simple binary matroids on n points. 2
1, 1, 2, 3, 5, 10, 20, 42, 102, 276, 857, 3233, 15113, 91717, 751479 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A code is projective if all columns are distinct and nonzero.

REFERENCES

H. Fripertinger and A. Kerber, in AAECC-11, Lect. Notes Comp. Sci. 948 (1995), 194-204.

D. Slepian, Some further theory of group codes. Bell System Tech. J. 39 1960 1219-1252.

M. Wild, Enumeration of binary and ternary matroids and other applications of the Brylawski-Lucas Theorem, Preprint Nr. 1693, Tech. Hochschule Darmstadt, 1994

LINKS

Table of n, a(n) for n=1..15.

H. Fripertinger, Isometry Classes of Codes

Index entries for sequences related to binary linear codes

CROSSREFS

Row sums of A076833. A diagonal of A091008.

Sequence in context: A262482 A293323 A257113 * A023170 A125312 A300550

Adjacent sequences:  A076831 A076832 A076833 * A076835 A076836 A076837

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Nov 21 2002

EXTENSIONS

More terms from Marcel Wild, Nov 26 2002

STATUS

approved

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Last modified January 29 07:03 EST 2020. Contains 331337 sequences. (Running on oeis4.)