-6608

Appears in sequences

• Riordan array (1/(1+2*x), x*(1+x)/(1+2*x)^2).at n=39A123876
• Triangle read by rows: coefficients of a Bessel polynomial recursion: P(x, n) = 2*(n-1)*P(x, n - 1)/x - n*P(x, n - 2) with substitution x -> 1/y.at n=25A136668