A112101 - OEIS

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A112101

Number of interval orders of magnitude n having no duplicate holdings (NODH).

1, 3, 10, 58, 722, 19826, 1161882, 141436842, 35192653666, 17733070720738, 17997787816364330, 36678689328450847514, 149831453090755680149490, 1225618861520566592060441682, 20064594684596858150355969600442, 657195622713393693107201875915723402 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	REFERENCES	`W. T. Trotter, Combinatorics and Partially Ordered Sets, Johns Hopkins, 1992; see p. 195.`
	FORMULA	`a(n) = Sum_{k=0..n} binomial(n, k)*A111491(k).`
	CROSSREFS	`Sequence in context: A002218 A107871 A111270 * A159321 A181077 A158873` `Adjacent sequences: A112098 A112099 A112100 * A112102 A112103 A112104`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 28 2005`

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Last modified February 17 16:00 EST 2012. Contains 206050 sequences.