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A051582
(2*n+8)!!/8!!, related to
A000165
(even double factorials).
+0
2
1, 10, 120, 1680, 26880, 483840, 9676800, 212889600, 5109350400, 132843110400, 3719607091200, 111588212736000, 3570822807552000, 121407975456768000, 4370687116443648000, 166086110424858624000, 6643444416994344960000
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Maintained by
N. J. A. Sloane
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.
AT&T Labs Research
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