OFFSET
0,5
COMMENTS
A set is called nondividing if no element divides the sum of any nonempty subset of the other elements.
T(n,k) = 0 for k>A068063(n). The triangle contains all positive values of T.
LINKS
Alois P. Heinz, Rows n = 0..65, flattened
Eric Weisstein's World of Mathematics, Nondividing Set
EXAMPLE
T(5,2) = 5, because there are 5 2-element nondividing subsets of {1,2,3,4,5}: {2,3}, {2,5}, {3,4}, {3,5}, {4,5}. T(7,3) = 1: {4,6,7}.
Triangle T(n,k) begins:
1;
1, 1;
1, 2;
1, 3, 1;
1, 4, 2;
1, 5, 5;
1, 6, 7;
1, 7, 12, 1;
...
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Alois P. Heinz, Mar 10 2011
STATUS
approved