200683

Appears in sequences

• a(n) = a(n-2) + (2n-1)a(n-1); a(0)=1, a(1)=1.at n=7A025164
• a(n) = denominator of the continued fraction which has the positive integers which are <= n and are coprime to n as its terms. The terms are written in order from n-1 for the integer part, to 1 for the final term of the continued fraction.at n=15A127616