A000809 - OEIS

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A000809

Number of switching networks (see Harrison reference for precise definition).
(Formerly M5258 N2290)

36, 1072, 2100736, 17592201773056, 2475880078571033228681936896, 98079714615416886934934209815610010226578261138395365376 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`The next term a(7) is too large to be displayed here.`
	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..12` `Index entries for sequences related to switching networks`
	FORMULA	`a(n) = (2^(32^n)+(2^n-1)2^(3*2^(n-1)))/2^n. [Sean A. Irvine, Jul 4 2011.]`
	PROG	`(MAGMA) [(2^(32^n)+(2^n-1)2^(3*2^(n-1)))/2^n: n in [1..8]]; // Vincenzo Librandi, Jul 04 2011`
	CROSSREFS	`Sequence in context: A025419 A180802 A184292 * A151584 A103278 A004294` `Adjacent sequences: A000806 A000807 A000808 * A000810 A000811 A000812`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`More terms from Sean A. Irvine (sairvin(AT)xtra.co.nz), Jul 03 2011`

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Last modified February 17 16:00 EST 2012. Contains 206050 sequences.