a(n) is the denominator of tan(n * arctan(1/n)).

A348141

a(n) is the denominator of tan(n * arctan(1/n)).

Terms

    a(0) =1a(1) =3a(2) =9a(3) =161a(4) =475a(5) =27755a(6) =60319a(7) =9722113a(8) =13913289a(9) =5707904499a(10) =5061910249

External references