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, 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

Table of n, a(n) for n=1..35.

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

Adjacent sequences: A048088 A048089 A048090 * A048092 A048093 A048094

Keyword

nonn

Author

Clark Kimberling

Status

approved