A091006 - OEIS

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A091006

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

1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 2, 1, 0, 0, 0, 1, 4, 3, 1, 0, 0, 0, 0, 5, 9, 4, 1, 0, 0, 0, 0, 5, 22, 19, 6, 1, 0, 0, 0, 0, 4, 40, 70, 35, 7, 1, 0, 0, 0, 0, 3, 60, 220, 190, 59, 9, 1, 0, 0, 0, 0, 2, 86, 629, 977, 466, 96, 11, 1, 0, 0, 0, 0, 1, 110, 1700

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OFFSET

1,19

LINKS

Table of n, a(n) for n=1..84.

H. Fripertinger, Isometry Classes of Codes

Index entries for sequences related to binary linear codes

EXAMPLE

1; 0,0; 0,1,0; 0,0,1,0; 0,0,1,1,0; 0,0,1,2,1,0; ...

CROSSREFS

Sequence in context: A127841 A017847 A350753 * A350433 A373480 A167365

Adjacent sequences: A091003 A091004 A091005 * A091007 A091008 A091009

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Mar 01 2004

STATUS

approved