a(n) = denominator of Sum_{k=1..n} 1/(2*k-1)!!.
A289488
a(n) = denominator of Sum_{k=1..n} 1/(2*k-1)!!.
Terms
- a(0) =1a(1) =3a(2) =5a(3) =105a(4) =945a(5) =3465a(6) =135135a(7) =2027025a(8) =883575a(9) =654729075a(10) =13749310575a(11) =8108567775a(12) =718713961875
External references
- oeis: A289488