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A048091
Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n+3)/3.
0
0, 0, 0, 0, 0, 0, 0, 3, 4, 24, 84, 105, 280, 630, 756, 1527, 2937, 3465, 6930, 15015, 18304, 44044, 108164, 135219, 328944, 767244, 953360, 2152710, 4738410, 5848238, 12890614, 28583709, 35471919, 80628669, 184657869
OFFSET
1,8
LINKS
O. Bagdasar, On some functions involving the lcm and gcd of integer tuples, Scientific Publications of the State University of Novi Pazar, Appl. Maths. Inform. and Mech., Vol. 6, 2 (2014), 91--100.
CROSSREFS
Sequence in context: A050801 A103093 A124632 * A189738 A256830 A065900
KEYWORD
nonn
STATUS
approved