OFFSET
1,2
COMMENTS
EXAMPLE
The a(1) = 1 through a(5) = 12 subsets:
{1} {2} {3} {4} {5}
{1,2} {1,3} {1,4} {1,5}
{2,3} {2,4} {2,5}
{3,4} {3,5}
{1,2,4} {4,5}
{2,3,4} {1,2,5}
{1,3,5}
{2,4,5}
{3,4,5}
{1,2,3,5}
{1,3,4,5}
{1,2,3,4,5}
MATHEMATICA
biqQ[y_]:=MemberQ[Total/@Subsets[y], Total[y]/2];
Table[Length[Select[Subsets[Range[n]], MemberQ[#, n]&&!biqQ[#]&]], {n, 15}]
KEYWORD
nonn,more
AUTHOR
Gus Wiseman, Apr 07 2024
STATUS
approved