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Search: id:A002727
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| A002727 |
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Number of 3 X n binary matrices.
(Formerly M3460 N1407)
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+0
21
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| 1, 4, 13, 36, 87, 190, 386, 734, 1324, 2284, 3790, 6080, 9473, 14378, 21323, 30974, 44159, 61898, 85440, 116286, 156240, 207446, 272432, 354162, 456097, 582238, 737205, 926298, 1155567, 1431892, 1763074, 2157904, 2626276, 3179278, 3829294
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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M. A. Harrison, On the number of classes of binary matrices, IEEE Trans. Computers, 22 (1973), 1048-1051.
A. Kerber, Experimentelle Mathematik, S\'{e}minaire Lotharingien de Combinatoire. Institut de Recherche Math. Avanc\'{e}e, Universit\'{e} Louis Pasteur, Strasbourg, Actes 19 (1988), 77-83.
B. Misek, On the number of classes of strongly equivalent incidence matrices. (Czech) Casopis Pest. Mat. 89 1964 211-218.
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..1000
Index entries for sequences related to binary matrices
Vladeta Jovovic, Binary matrices up to row and column permutations
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FORMULA
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G.f.: (x^6+x^4+2*x^3+x^2+1)/((1-x)^4*(1-x^2)^2*(1-x^3)^2).
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CROSSREFS
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Cf. A002623, A006148.
Sequence in context: A089453 A057159 A095941 this_sequence A036629 A079922 A053563
Adjacent sequences: A002724 A002725 A002726 this_sequence A002728 A002729 A002730
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KEYWORD
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nonn,nice,easy
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AUTHOR
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njas
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EXTENSIONS
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More terms and g.f. from Vladeta Jovovic (vladeta(AT)Eunet.yu), Feb 04 2000
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