A066275 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A066275

Number of endofunctions of [n] such that some element is fixed, but 1 is not fixed.

0, 1, 10, 111, 1476, 23255, 425958, 8915263, 210156040, 5513215599, 159374246010, 5034663700847, 172583816090700, 6380915666604583, 253132868797656526, 10725414213389814015, 483431164831317069840 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,3`
	LINKS	`Table of n, a(n) for n=1..17.`
	FORMULA	`a(n) = n^n-n^(n-1)-(n-1)^n. E.g.f.: (T^3-T^2+T-x)/(T-T^2), where T=T(x) is Euler's tree function (see A000169).`
	EXAMPLE	`a(2)=1: [1->2,2->2].`
	MAPLE	`A066275 := proc(n)` `n^n-n^(n-1)-(n-1)^n ;` `end proc: # R. J. Mathar, Oct 31 2015`
	CROSSREFS	`Cf. A045531, A066274.` `Sequence in context: A176736 A084031 A210507 * A344398 A046164 A322724` `Adjacent sequences: A066272 A066273 A066274 * A066276 A066277 A066278`
	KEYWORD	`nonn`
	AUTHOR	`Len Smiley, Dec 09 2001`
	STATUS	`approved`

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 15 23:51 EDT 2022. Contains 353687 sequences. (Running on oeis4.)