A076837 Triangle T(n,k) read by rows giving number of inequivalent projective indecomposable binary linear [n,k] codes (n >= 1, 1 <= k <= n).

1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 2, 1, 0, 0, 1, 4, 3, 1, 0, 0, 0, 5, 9, 4, 1, 0, 0, 0, 5, 22, 19, 6, 1, 0, 0, 0, 4, 40, 70, 35, 7, 1

Offset

1,15

Comments

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

References

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

Links

Table of n, a(n) for n=1..46.

Index entries for sequences related to binary linear codes

Example

1; 0; 0,1; 0,0,1; 0,0,1,1; 0,0,1,2,1; 0,0,1,4,3,1; 0,0,0,5,9,4,1; ...

Crossrefs

Cf. A076838 (row sums).

Sequence in context: A255517 A188816 A168312 * A055363 A363845 A350681

Adjacent sequences: A076834 A076835 A076836 * A076838 A076839 A076840

Keyword

nonn,tabf,more

Author

N. J. A. Sloane, Nov 21 2002

Status

approved