A002875 - OEIS

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A002875

Sorting numbers (see Motzkin article for details).
(Formerly M1300 N0498)

1, 2, 4, 24, 128, 880, 7440 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`How is the sequence defined (see the links in A000262)? Also more terms would be welcome.`
	REFERENCES	`T. S. Motzkin, Sorting numbers for cylinders and other classification numbers, in Combinatorics, Proc. Symp. Pure Math. 19, AMS, 1971, pp. 167-176.` `N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).` `N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).`
	LINKS	`Index entries for sequences related to sorting`
	CROSSREFS	`Cf. A036073, A001861, A002872, A002873, A002874, A000262` `Sequence in context: A170931 A164313 A087981 * A110491 A019010 A009672` `Adjacent sequences: A002872 A002873 A002874 * A002876 A002877 A002878`
	KEYWORD	`nonn,nice,more,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 14 17:10 EST 2012. Contains 205644 sequences.