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A048072
Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n+2)/3.
+0
1
0, 0, 1, 2, 6, 13, 21, 45, 91, 154, 322, 645, 1125, 2325, 4651, 8301, 17061, 34123, 61915, 126763, 253527, 465746, 950818, 1901637, 3527109, 7184421, 14368843, 26855641, 54604081, 109208163, 205390163, 416990563, 833981127
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.
AT&T Labs Research
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