940839860961
domain: N
Appears in sequences
- Denominator of b(n) given by b(1) = 1, b(2) = 2; for n >= 3, b(n) = (-1)^n (2n-1) ((n-2)!!)^2/((n-1)!!)^2, where n!! is the double factorial A006882.at n=21A095175
- Denominators in the fractional coefficients that form the partial quotients of the continued fraction representation of the inverse tangent of 1/x.at n=21A110256
- Denominators in the coefficients that form the even-indexed partial quotients of the continued fraction representation of the inverse tangent of 1/x.at n=10A110260
- 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=22A239225
- a(n) = denominator((2^n*(n!)^2/(1+2*n)!)^2).at n=10A392619