234356domain: NAppears in sequencesExpansion of (1 + 5*x)/(1 + 9*x + 25*x^2).at n=10A087171Expansion of 1/(1-x*(1-5*x)).at n=20A106854Antidiagonal sums of the row-reversed triangle A048998 of Bernoulli polynomial coefficients.at n=8A122596Central coefficients of the Riordan matrix (1/(1-3*x^2),x/(1-x)) (A191582).at n=10A191585