a(n) is the denominator of Sum_{k=1..n} (-1)^(k+1) / (2*k-1)!!.
A354299
a(n) is the denominator of Sum_{k=1..n} (-1)^(k+1) / (2*k-1)!!.
Terms
- a(0) =1a(1) =3a(2) =15a(3) =105a(4) =189a(5) =10395a(6) =135135a(7) =2027025a(8) =34459425a(9) =130945815a(10) =13749310575a(11) =316234143225
External references
- oeis: A354299