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A085489 a(n) = number of subsets of {1,...,n} containing no solutions to x+y=z with x and y distinct (one version of "sum-free subsets"). +0
7
2, 4, 7, 13, 22, 37, 61, 102, 162, 261, 410, 646, 1001, 1553, 2370, 3645, 5515, 8303, 12470, 18713, 27811, 41244, 60962, 89733, 131870, 192522, 281125, 408680, 593880, 855661, 1238592, 1779614, 2563476, 3660084, 5255913, 7473380, 10696444, 15137517 (list; graph; listen)
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.


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