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A127688 (n+1)^n - (2n)!!. 1
0, 1, 7, 61, 617, 7761, 117601, 2097047, 43046337, 999999055, 25937420761, 743008360293, 23298085076401, 793714773119009, 29192926024745505, 1152921504604819951, 48661191875656546561, 2185911559738662072543, 104127350297911055738281, 5242879999999999345270925 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Theorem: (n+1)^n > (2n)!! for n>0.

REFERENCES

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

LINKS

Table of n, a(n) for n=0..19.

CROSSREFS

Cf. A000165, A127650.

Sequence in context: A077642 A071172 A259335 * A111532 A061634 A049402

Adjacent sequences:  A127685 A127686 A127687 * A127689 A127690 A127691

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 03 2007

STATUS

approved

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Last modified November 19 16:35 EST 2019. Contains 329320 sequences. (Running on oeis4.)