A000869 - OEIS

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A000869

Number of switching networks with C(2,n) acting on domain and GL(3,Z2) acting on range.
(Formerly M3620 N1470)

4, 27, 14056, 104751025086, 14737381492157353997140846, 583807825091767184801127161305581049499763751729421166 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Next term has 112 digits. [Sean A. Irvine, Jan 24, 2012]`
	REFERENCES	`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).`
	LINKS	`Index entries for sequences related to switching networks`
	EXAMPLE	`a(n)=(8^(2^n)+222^(2^n+2^(n-1)+n)-222^(2^n+2^(n-1))+214^(2^n)+562^(2^n)+422^(n+2^n)+562^(2^(n-1)+n)-562^(2^(n-1))+482^n)/(168*2^n). [Sean A. Irvine, Jan 24, 2012]`
	CROSSREFS	`Sequence in context: A132641 A008973 A132646 * A132640 A174212 A038706` `Adjacent sequences: A000866 A000867 A000868 * A000870 A000871 A000872`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`More terms from Sean A. Irvine (sairvin(AT)xtra.co.nz), Jan 23 2012`

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Last modified February 16 17:48 EST 2012. Contains 205939 sequences.