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A351731

Number of labeled idempotent monoids of order n.

1, 2, 12, 140, 3020, 100362, 4768624, 305498328, 25293331098, 2619996058190 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..10.`
	FORMULA	`a(n) = n * A351731(n-1).`
	CROSSREFS	`Main diagonal of A058157.` `Cf. A058153, A351730.` `Sequence in context: A287885 A091144 A275829 * A240387 A087800 A009747` `Adjacent sequences: A351728 A351729 A351730 * A351732 A351733 A351734`
	KEYWORD	`nonn,hard,more`
	AUTHOR	`Andrew Howroyd, Feb 17 2022`
	STATUS	`approved`

Last modified September 12 09:47 EDT 2024. Contains 375850 sequences. (Running on oeis4.)