-13034

Appears in sequences

• Determinant of n X n Hankel matrix whose entries are 1-A010060(i+j), where A010060 is the Thue-Morse sequence.at n=27A274330
• a(n) = 1 + Sum_{i=1..n} (-1)^i * Product_{j=1..i} floor(n/j).at n=15A331213