A000868 - OEIS

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A000868

Number of switching networks with C(2,n) acting on domain and GL(2,Z2) acting on range.
(Formerly M3580 N1451)

4, 21, 1531, 44782251, 96076794891512491, 886151997189943927518995693301312171, 150770949527755462791108053396729046910357127815416821444325531778055580331 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Next term has 151 digits. - Sean A. Irvine, Jan 23 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	`Vincenzo Librandi, Table of n, a(n) for n = 1..10` `Index entries for sequences related to switching networks`
	FORMULA	`a(n) = (2^(2^(n+1)) + 2^(n+2 + 2^n) - 2^(2^n) + 2^(n+1))/(3*2^(n+1)). - Sean A. Irvine, Jan 23 2012`
	CROSSREFS	`Sequence in context: A118909 A225157 A158947 * A000875 A094046 A326603` `Adjacent sequences: A000865 A000866 A000867 * A000869 A000870 A000871`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane`
	EXTENSIONS	`More terms from Sean A. Irvine, Jan 22 2012`
	STATUS	`approved`

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Last modified August 29 13:17 EDT 2024. Contains 375517 sequences. (Running on oeis4.)