1421200

Appears in sequences

• a(n) = 20*C(2n,n)*(2n+1)/(n+4).at n=9A078820
• G.f.: A(x) = exp( 2*Sum_{n>=1} 2^n/A006519(n) * x^n/n ), where A006519(n) = highest power of 2 dividing n.at n=18A162588