A066302 - OEIS

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A066302

Reduced partially ordered sets (posets) with n labeled elements.

1, 1, 1, 7, 75, 1531, 50673, 2613703, 202180723, 22853355895, 3701983130913, 846741042881779, 270316009546766571, 119343586350194910211, 72325998629777739416209, 59798727157327673157936319 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,4`
	REFERENCES	`F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Cambridge, 1998, pg 57 (1.4.70).`
	LINKS	`Table of n, a(n) for n=0..15.` `Index entries for sequences related to posets`
	FORMULA	`E.g.f. A(x)=B(x/(1+x)) where B(x) is e.g.f. of A001035.` `E.g.f. A(x)=exp(B(x)) where B(x) is e.g.f. of A066303.`
	CROSSREFS	`Sequence in context: A127190 A121316 A220215 * A106162 A139472 A180356` `Adjacent sequences: A066299 A066300 A066301 * A066303 A066304 A066305`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower, Dec 12 2001`
	STATUS	`approved`

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Last modified May 23 12:58 EDT 2013. Contains 225588 sequences.