A100728 - OEIS

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A100728

Number of rank-(n-2) simple matroids on S_n.

1, 31, 337, 2570, 16865, 104858, 650761, 4145956, 27483392, 190522216, 1382087111, 10478149999, 82860356456, 682066659044, 5832719543338, 51724107920729, 474869705028520, 4506715494154371, 44152005320340946 (list; graph; refs; listen; history; internal format)

	OFFSET	`4,2`
	LINKS	`W. M. B. Dukes, On the number of matroids on a finite set`
	FORMULA	`Bell(n+1) - (n^2+n+4)2^(n-2) + n(n+1)(3n^2-n+10)/24.`
	CROSSREFS	`Sequence in context: A123568 A111675 A142495 * A197644 A156150 A125419` `Adjacent sequences: A100725 A100726 A100727 * A100729 A100730 A100731`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, Nov 29 2004`

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Last modified February 16 06:22 EST 2012. Contains 205860 sequences.