id:A047832 - OEIS Search Results

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Number of self-complementary binary relations on a 2n-element set.

+0
7

2, 36, 5600, 11220000, 293293716992, 102484848265030656, 491247277315343649710080, 32966971058719932671168222859264, 31464896751148469761776612436741418123264 (list; graph; listen)

	OFFSET	`1,1`
	REFERENCES	`Wille D., Enumeration of self-complementary structures, J. Comb. Theory B 25 (1978) 143-150.`
	CROSSREFS	`a(n) = A000171(4*n+1).` `Sequence in context: A126934 A001070 A095229 this_sequence A004003 A060739 A134366` `Adjacent sequences: A047829 A047830 A047831 this_sequence A047833 A047834 A047835`
	KEYWORD	`nonn,nice`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs)`

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.

AT&T Labs Research