83120346

Appears in sequences

• a(n+1) = n*a(n) + a(n-1) with a(0)=0, a(1)=1.at n=12A001040
• 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=12A127616