77010795

Appears in sequences

• Product_{n>=1} (1 + 2*a(n)*x^n) = Sum_{k>=0} binomial(2*k, k)*x^k = 1/sqrt(1 - 4*x), with the central binomial numbers A000984(n).at n=15A157163
• Write exp(-x) = Product_{n>=1} (1 + g_n * x^n); a(n) = numerator(g_n).at n=31A170910
• a(n) = numerator of the coefficient c(n) of x^n in (1/sqrt(1-x))/Product_{k=1..n-1} 1 + c(k)*x^k, n = 1, 2, 3, ...at n=15A170924