256768

Appears in sequences

• arcsinh(arcsin(x)*sin(x))=2/2!*x^2-80/6!*x^6+1344/8!*x^8+256768/10!*x^10...at n=4A012334
• a(n) = Sum_{k=0..n} (k+1) * 2^k * 3^(n-k) * binomial(k,n-k)^2.at n=7A391677