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A006380
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Number of equivalence classes of 4 X n binary matrices when one can permute rows, permute columns and complement columns.
(Formerly M2735)
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5
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1, 3, 8, 19, 41, 81, 153, 273, 468, 774, 1240, 1930, 2933, 4356, 6341, 9064, 12743, 17643, 24093, 32479, 43270, 57019, 74377, 96103, 123089, 156354, 197081, 246622, 306519, 378520, 464614, 567028, 688276, 831169, 998845, 1194793, 1422899, 1687447, 1993182
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| M. A. Harrison, On the number of classes of binary matrices, IEEE Trans. Computers, 22 (1973), 1048-1051.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| Index entries for sequences related to binary matrices
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CROSSREFS
| Cf. A000601, A006148, A006383.
Sequence in context: A067332 A082535 A136396 * A182818 A095846 A153732
Adjacent sequences: A006377 A006378 A006379 * A006381 A006382 A006383
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Terms a(7) onwards from Max Alekseyev (maxale(AT)gmail.com), Feb 05 2010
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