The On-Line Encyclopedia of Integer Sequences (OEIS)

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A127650

n^n - (2n-1)!!.
(history; published version)

#3 by Russ Cox at Fri Mar 30 16:50:40 EDT 2012

AUTHOR

_N. J. A. Sloane (njas(AT)research.att.com), _, Apr 03 2007

Discussion

Fri Mar 30

16:50

OEIS Server: https://oeis.org/edit/global/110

#2 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

KEYWORD

nonn,new

nonn

AUTHOR

N. J. A. Sloane (njas, (AT)research.att.com), Apr 03 2007

#1 by N. J. A. Sloane at Fri May 11 03:00:00 EDT 2007

NAME

n^n - (2n-1)!!.

DATA

0, 1, 12, 151, 2180, 36261, 688408, 14750191, 352961064, 9345270925, 271562360036, 8599866305031, 294969253011628, 10898548778881141, 431703607027230000, 18254845289747040991, 820907602015573913552, 39124764979819837803549, 1970218861127675697564604

OFFSET

1,3

COMMENTS

Theorem: n^n > (2n-1)!! for n>1.

REFERENCES

D. S. Mitrinovic, Analytic Inequalities, Springer-Verlag, 1970; p. 192, 3.1.15.

CROSSREFS

Cf. A001147, A127688.

KEYWORD

nonn

AUTHOR

njas, Apr 03 2007

STATUS

approved