A003069 - OEIS

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A003069

Number of n-node digraphs with same converse as complement.
(Formerly M1525)

1, 1, 2, 5, 20, 88, 632, 8816 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	REFERENCES	`E. M. Palmer, Graphical enumeration problems, pp. 187-206 of F. Harary, editor, New Directions in the Theory of Graphs. Academic Press, NY, 1973.` `N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).`
	CROSSREFS	`Sequence in context: A006228 A190656 A002484 * A115082 A020105 A020005` `Adjacent sequences: A003066 A003067 A003068 * A003070 A003071 A003072`
	KEYWORD	`nonn,more`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 15 06:55 EST 2012. Contains 205694 sequences.