id:A055969 - OEIS Search Results

Search: id:A055969

Displaying 1-1 of 1 results found.

page 1

Number of unlabeled digraphs with n nodes and an odd number of arcs.

+0
1

0, 1, 6, 104, 4736, 770112, 440994608, 896679244544, 6513978322585408, 170630215971902124288, 16261454692523251085611648, 5683372715412699486531047331840, 7334542846356464931239079919515090432 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n)=(A000273(n)-A003086(n))/2.`
	CROSSREFS	`Cf. A054928, A007869, A054960.` `Sequence in context: A106304 A006676 A006768 this_sequence A112822 A033589 A077289` `Adjacent sequences: A055966 A055967 A055968 this_sequence A055970 A055971 A055972`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 19 2000`

page 1

Search completed in 0.002 seconds

Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research