login
This site is supported by donations to The OEIS Foundation.

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A034254 Triangle read by rows giving T(n,k) = number of inequivalent indecomposable linear [ n,k ] binary codes without 0 columns (n >= 2, 1 <= k <= n). 27
1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 3, 5, 3, 1, 1, 4, 10, 10, 4, 1, 1, 5, 18, 28, 18, 5, 1, 1, 7, 31, 71, 71, 31, 7, 1, 1, 8, 51, 165, 250, 165, 51, 8, 1, 1, 10, 79, 361, 809, 809, 361, 79, 10, 1, 1, 12, 121, 754, 2484, 3759, 2484, 754, 121, 12 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,8

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.

LINKS

Table of n, a(n) for n=1..65.

H. Fripertinger, Isometry Classes of Codes

Index entries for sequences related to binary linear codes

EXAMPLE

1; 1,1; 1,1,1; 1,2,2,1; 1,3,5,3,1; 1,4,10,10,4,1; ...

CROSSREFS

Cf. A076836 (row sums), A034253.

Sequence in context: A054106 A132044 A034327 * A157103 A135966 A060351

Adjacent sequences:  A034251 A034252 A034253 * A034255 A034256 A034257

KEYWORD

tabl,nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified September 1 07:45 EDT 2014. Contains 246288 sequences.