A048028 Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n-3)/3.

0, 0, 0, 0, 0, 10, 15, 21, 77, 126, 198, 570, 975, 1617, 4213, 7425, 12753, 31421, 56511, 99403, 236203, 431098, 771562, 1787346, 3298527, 5981865, 13598053, 25314061, 46385069, 103918153, 194810143, 359965939, 797154723, 1502994133

Offset

1,6

Links

Table of n, a(n) for n=1..34.

Crossrefs

Sequence in context: A030663 A013638 A075524 * A048045 A257631 A115682

Adjacent sequences: A048025 A048026 A048027 * A048029 A048030 A048031

Keyword

nonn

Author

Clark Kimberling

Status

approved