A054948 - OEIS

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A054948

Number of labeled semi-strong digraphs on n nodes.

1, 2, 22, 1688, 573496, 738218192, 3528260038192, 63547436065854848, 4400982906402148836736, 1190477715153930158152163072, 1270476960212865235273469079407872, 5381083212549793228422395071641588743168, 90765858793484859057065439213726376149311958016 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.`
	FORMULA	`E.g.f.: 1/(1-B(x)) where B(x) is e.g.f. for A054947. - Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 11 2003`
	CROSSREFS	`Sequence in context: A202947 A177410 A193486 * A104149 A113761 A054349` `Adjacent sequences: A054945 A054946 A054947 * A054949 A054950 A054951`
	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), Mar 11 2003`

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Last modified February 16 07:10 EST 2012. Contains 205874 sequences.