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Search: id:A000909
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A000909 (2n)!(2n+1)! / n!^2. +0
2
1, 12, 720, 100800, 25401600, 10059033600, 5753767219200, 4487938430976000, 4577697199595520000, 5914384781877411840000, 9439358111876349296640000, 18236839872145106841108480000, 41944731705933745734549504000000 (list; graph; listen)
OFFSET

0,2

REFERENCES

E. R. Hansen, A Table of Series and Products, Prentice-Hall, Englewood Cliffs, NJ, 1975, p. 96.

CROSSREFS

a(n) = 4^n * A079484(n+1).

Sequence in context: A071307 A060612 A002196 this_sequence A061025 A042749 A089036

Adjacent sequences: A000906 A000907 A000908 this_sequence A000910 A000911 A000912

KEYWORD

nonn

AUTHOR

njas

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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