A348481 a(n) is the number of n-element subsets of {1,2,3,...,A347498(n)} with the property that all products i * j are distinct for i <= j.

1, 1, 1, 3, 1, 1, 1, 5, 15, 6, 12, 45, 2, 65, 4, 4, 4, 44, 2, 392

Offset: 1

Author

Peter Kagey, Oct 20 2021

Keywords

• nonn
• more

Examples

			For n = 8, A347498(n) = 11, and the a(8) = 5 8-element subsets of {1,2,...,11} with distinct pairwise products are
{1,2,5,6,7,8,9,11};
{1,2,6,7,8,9,10,11};
{1,5,6,7,8,9,10,11};
{2,3,5,7,8,9,10,11}; and
{2,5,6,7,8,9,10,11}.
		

Crossrefs

Cf. A347498, A347499.

Extensions

a(18)-a(20) from Michael S. Branicky, Oct 28 2021