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A050291 Number of double-free subsets of {1, 2, ..., n}. +0
11
2, 3, 6, 10, 20, 30, 60, 96, 192, 288, 576, 960, 1920, 2880, 5760, 9360, 18720, 28080, 56160, 93600, 187200, 280800, 561600, 898560, 1797120, 2695680, 5391360, 8985600, 17971200, 26956800, 53913600, 87091200, 174182400, 261273600 (list; graph; listen)
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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