1181568

Appears in sequences

• a(n) = (n^2 - 1)*(n^2 - 3).at n=33A033596
• G.f.: A(x) = exp( 2*Sum_{n>=1} sigma(n)*A006519(n) * x^n/n ), where A006519(n) = highest power of 2 dividing n.at n=20A162584
• A bisection of A162584.at n=10A163228