15591025

Appears in sequences

• Expansion of e.g.f. S(x) satisfying S(x) = sinh( x*cosh( 2*x*sqrt(1 + S(x)^2) ) ), where a(n) is the coefficient of x^(2*n+1)/(2*n+1)! in S(x) for n >= 0.at n=4A372812