A059201 - OEIS

This site is supported by donations to The OEIS Foundation.

A059201

Number of T_0-covers of a labeled n-set.

1, 1, 4, 96, 31692, 2147001636, 9223371991763269704, 170141183460469231473432887375376674952, 57896044618658097711785492504343953920509909728243389682424010192567186540224 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	COMMENTS	`A cover of a set is a T_0-cover if for every two distinct points of the set there exists a member (block) of the cover containing one but not the other point.`
	LINKS	`Vladeta Jovovic, T_0-covers of a labeled 3-set`
	FORMULA	`a(n)=Sum_{i=0..n+1} stirling1(n+1, i)*2^(2^(i-1)-1).`
	CROSSREFS	`Cf. A003465, row sums of A059202, A059203, A059084-A059089.` `Sequence in context: A146514 A181335 A098695 * A027638 A041275 A024384` `Adjacent sequences: A059198 A059199 A059200 * A059202 A059203 A059204`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic, Goran Kilibarda (vladeta(AT)eunet.rs), Jan 16 2001`

Content is available under The OEIS End-User License Agreement .

Last modified February 14 07:14 EST 2012. Contains 205586 sequences.