A002857 - OEIS

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A002857

Number of Post functions of n variables.
(Formerly M3078 N1249)

1, 3, 20, 996, 9333312, 6406603084568576, 16879085743296493582043922521915392, 717956902513121252476003434439730211917452457474409186632352788205535232 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	REFERENCES	`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).` `Wheeler, Roger F.; Complete propositional connectives. Z. Math. Logik Grundlagen Math. 7 1961 185-198.`
	LINKS	`Table of n, a(n) for n=1..8.`
	CROSSREFS	`Equals A000612/2 and A003180/4.` `Sequence in context: A089943 A108699 A162134 * A203314 A174652 A024011` `Adjacent sequences: A002854 A002855 A002856 * A002858 A002859 A002860`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane.`
	EXTENSIONS	`More terms from Vladeta Jovovic, Feb 23 2000`
	STATUS	`approved`

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Last modified May 25 04:43 EDT 2013. Contains 225639 sequences.