310134825

Appears in sequences

• a(n) = (2n+2)!/(n!*2^(n+1)).at n=8A001879
• Triangle of coefficients of Bessel polynomials {y_n(x)}'.at n=44A065931
• Reduced denominators of x^(2n) in the series expansion of erf(x)^2 Pi/4 about 0.at n=9A103980