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A006380 Number of equivalence classes of 4 X n binary matrices when one can permute rows, permute columns and complement columns.
(Formerly M2735)
6
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; text; internal format)
OFFSET

0,2

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).

LINKS

Table of n, a(n) for n=0..38.

M. A. Harrison, On the number of classes of binary matrices, IEEE Transactions on Computers, C-22.12 (1973), 1048-1052. (Annotated scanned copy)

Index entries for sequences related to binary matrices

CROSSREFS

Cf. A000601, A006148, A006383.

Sequence in context: A082535 A007326 A136396 * A260547 A182818 A095846

Adjacent sequences:  A006377 A006378 A006379 * A006381 A006382 A006383

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Terms a(7) onwards from Max Alekseyev, Feb 05 2010

STATUS

approved

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Last modified October 15 00:14 EDT 2019. Contains 328025 sequences. (Running on oeis4.)