id:A054928 - OEIS Search Results

Search: id:A054928

Displaying 1-1 of 1 results found.

page 1

Complementary pairs of directed graphs on n nodes. Also unlabeled digraphs with n nodes and an even number of arcs.

+0
3

1, 2, 10, 114, 4872, 770832, 441038832, 896679948304, 6513978501814144, 170630215981070456064, 16261454692532635025585792, 5683372715412701087902846672384, 7334542846356464937798016155801130496 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.`
	FORMULA	`Average of A000273 and A003086.`
	CROSSREFS	`Cf. A007869, A054960.` `Sequence in context: A005613 A005616 A113089 this_sequence A132522 A131811 A006121` `Adjacent sequences: A054925 A054926 A054927 this_sequence A054929 A054930 A054931`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 24 2000`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 19 2000`

page 1

Search completed in 0.002 seconds

Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

AT&T Labs Research