1329696225

Appears in sequences

• Successive denominators of Wallis's approximation to Pi/2 (reduced).at n=17A001902
• Denominators of the column sums of the BG2 matrix.at n=8A161736
• 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=17A239225
• a(n) is the smallest odd number that has n middle divisors.at n=20A354385
• 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=18A380949