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A050293
Number of 3-fold-free subsets of {1, 2, ..., n}.
+0
2
2, 4, 6, 12, 24, 36, 72, 144, 240, 480, 960, 1440, 2880, 5760, 8640, 17280, 34560, 57600, 115200, 230400, 345600, 691200, 1382400, 2073600, 4147200, 8294400, 13271040, 26542080, 53084160, 79626240, 159252480, 318504960
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.
AT&T Labs Research
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