OFFSET
1,5
COMMENTS
All terms are odd.
EXAMPLE
Triangle begins:
1
1 1
1 3 1
1 3 3 1
1 3 7 3 1
1 3 9 9 3 1
1 3 9 19 9 3 1
1 3 9 25 25 9 3 1
1 3 9 29 51 29 9 3 1
1 3 9 31 75 75 31 9 3 1
1 3 9 31 93 151 93 31 9 3 1
1 3 9 31 105 235 235 105 31 9 3 1
The subsets counted in row n = 5:
{1} {2} {3} {4} {5}
{1,3} {1,5} {3,5}
{1,2,3} {2,4} {3,4,5}
{1,3,5}
{2,3,4}
{1,2,4,5}
{1,2,3,4,5}
MATHEMATICA
Table[Length[Select[Subsets[Range[n]], Mean[#]==k&]], {n, 10}, {k, n}]
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gus Wiseman, Sep 13 2019
STATUS
approved