Denominator of 1 + 1/5 + 1/9 +...+ 1/(4n+1).

A097328

Denominator of 1 + 1/5 + 1/9 +...+ 1/(4n+1).

Terms

    a(0) =1a(1) =5a(2) =45a(3) =585a(4) =9945a(5) =69615a(6) =348075a(7) =10094175a(8) =111035925a(9) =4108329225a(10) =168441498225a(11) =56147166075a(12) =393030162525

External references