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A034254
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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).
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27
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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;
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internal format)
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OFFSET
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1,8
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REFERENCES
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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.
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LINKS
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Table of n, a(n) for n=1..65.
H. Fripertinger, Isometry Classes of Codes
Index entries for sequences related to binary linear codes
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EXAMPLE
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1; 1,1; 1,1,1; 1,2,2,1; 1,3,5,3,1; 1,4,10,10,4,1; ...
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CROSSREFS
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Cf. A076836 (row sums), A034253.
Sequence in context: A054106 A132044 A034327 * A157103 A135966 A060351
Adjacent sequences: A034251 A034252 A034253 * A034255 A034256 A034257
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KEYWORD
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tabl,nonn
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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