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A000869
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Number of switching networks with C(2,n) acting on domain and GL(3,Z2) acting on range.
(Formerly M3620 N1470)
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1
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OFFSET
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1,1
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COMMENTS
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Next term has 112 digits. [Sean A. Irvine, Jan 24, 2012]
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REFERENCES
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M. A. Harrison, On the number of classes of switching networks, J. Franklin Instit., 276 (1963), 313-327.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..10
Index entries for sequences related to switching networks
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EXAMPLE
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a(n)=(8^(2^n)+22*2^(2^n+2^(n-1)+n)-22*2^(2^n+2^(n-1))+21*4^(2^n)+56*2^(2^n)+42*2^(n+2^n)+56*2^(2^(n-1)+n)-56*2^(2^(n-1))+48*2^n)/(168*2^n). [Sean A. Irvine, Jan 24, 2012]
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PROG
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(MAGMA) [(8^(2^n)+22*2^(2^n+2^(n-1)+n)-22*2^(2^n+2^(n-1))+21*4^(2^n)+56*2^(2^n)+42*2^(n+2^n)+56*2^(2^(n-1)+n)-56*2^(2^(n-1))+48*2^n)/(168*2^n): n in [1..11]]; // Vincenzo Librandi, Mar 28 2012
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CROSSREFS
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Sequence in context: A132641 A008973 A132646 * A132640 A174212 A038706
Adjacent sequences: A000866 A000867 A000868 * A000870 A000871 A000872
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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More terms from Sean A. Irvine, Jan 23 2012
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STATUS
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approved
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