A091008 - OEIS

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A091008

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

1, 0, 1, 0, 1, 2, 0, 0, 2, 3, 0, 0, 1, 4, 5, 0, 0, 1, 5, 9, 10, 0, 0, 1, 6, 14, 19, 20, 0, 0, 0, 6, 21, 35, 41, 42, 0, 0, 0, 5, 34, 72, 94, 101, 102, 0, 0, 0, 4, 50, 155, 235, 267, 275, 276, 0, 0, 0, 3, 67, 340, 652, 803, 847, 856, 857, 0, 0, 0, 2, 91, 791, 2076, 2897

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..74.

H. Fripertinger, Isometry Classes of Codes

Index entries for sequences related to binary linear codes

CROSSREFS

A076834 gives last diagonal. Running sums across rows of triangle A076833.

Sequence in context: A128541 A122908 A296441 * A111006 A046742 A263138

Adjacent sequences: A091005 A091006 A091007 * A091009 A091010 A091011

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Mar 01 2004

STATUS

approved