OFFSET
0,2
LINKS
Fausto A. C. Cariboni, Table of n, a(n) for n = 0..150 (terms 0..60 from Giovanni Resta)
EXAMPLE
The a(0) = 1 through a(4) = 13 subsets:
{} {} {} {} {}
{1} {1} {1} {1}
{2} {2} {2}
{1,2} {3} {3}
{1,2} {4}
{1,3} {1,2}
{2,3} {1,3}
{1,4}
{2,3}
{2,4}
{3,4}
{1,2,4}
{2,3,4}
MATHEMATICA
Table[Length[Select[Subsets[Range[n]], UnsameQ@@Plus@@@Subsets[#]&]], {n, 0, 10}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Jun 01 2019
EXTENSIONS
a(18)-a(42) from Alois P. Heinz, Jun 03 2019
STATUS
approved