10667118605
domain: N
Appears in sequences
- Successive denominators of Wallis's approximation to Pi/2 (reduced).at n=19A001902
- Denominators of the column sums of the BG2 matrix.at n=9A161736
- Denominator of 2n/v(n)^2, where v(1) = 0, v(2) = 1, and v(n) = v(n-1)/(n-2) + v(n-2) for n >= 3. (Limit of 2n/v(n)^2 is Pi.)at n=19A239225
- a(n) = numerator(r(n)) where r(n) = (n/2)*(Pi/2)^cos(Pi*(n-1))*((n/2-1/2)!/(n/2)!)^2.at n=20A380949