a(n) is the denominator of Sum_{k=1..n} (-1)^(k+1) / (k*k!).
A354404
a(n) is the denominator of Sum_{k=1..n} (-1)^(k+1) / (k*k!).
Terms
- a(0) =1a(1) =4a(2) =36a(3) =288a(4) =7200a(5) =10800a(6) =264600a(7) =33868800a(8) =914457600a(9) =4572288000a(10) =553246848000
External references
- oeis: A354404