353740

Appears in sequences

• a(n) = (2^n + C(2*n,n))/2.at n=11A005317
• Triangle of coefficients of polynomials P_n(z) defined by the recursion P_0(z) = z+1; for n>=1, P_n(z) = z + Product_{k=0..n-1} P_k(z).at n=30A177701