277526

Appears in sequences

• G.f.: A(x) = 1 + x*A(x)*A(-x) + x^2*exp( Sum_{n>=1} 2*L(n)^2*x^(2*n)/n ), where A(x) = exp(Sum_{n>=1} L(n)*x^n/n).at n=33A205566
• a(n) = (3*n^4 - 4*n^3 + n^2 + 4*n + 4)/4.at n=25A366478