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Multifactorial
A generalization of the factorial and double
factorial,
etc., where the products run through positive integers.
The following table lists the values of the first few multifactorials for  , 2, ....
 | A000142 | 1, 2, 6, 24, 120,
720, ... |  | A006882 | 1, 2, 3, 8, 15, 48,
105, ... |  | A007661 | 1, 2, 3, 4, 10, 18,
28, 80, 162, 280, ... |  | A007662 | 1, 2, 3, 4, 5, 12,
21, 32, 45, 120, ... |
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double factorial