OFFSET
1,2
COMMENTS
Conjecture: a(n) > 0.
If the conjecture is true, all terms are powers of two, and a(n) >= A259527(n).
a(n) = 0 if and only if A066400(n) = 2.
a(n) = 0 if and only if A255167(n) = 0.
a(n) <= 2^(A067722(n) - 1). - Peter Kagey, Nov 13 2018
LINKS
Peter Kagey, Table of n, a(n) for n = 1..200
EXAMPLE
For n = 3, the a(3) = 8 subsets of {4, 5, ..., 11} with a product with squarefree part of 3 are {4, 5, 6, 9, 10}, {4, 5, 6, 10}, {4, 6, 8}, {4, 6, 8, 9}, {5, 6, 9, 10}, {5, 6, 10}, {6, 8}, and {6, 8, 9}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Kagey, Jun 08 2018
STATUS
approved