a(n) = denominator of b(n), where sum{m>=0} b(m)*x^m/m! = x/(sum{m>=1} H(m) x^m/ m!) = exp(-x)*x/(sum{m>=1} x^m (-1)^(m+1)/(m!*m)). (H(m) = sum{k=1 to m} 1/k.).
A128062
a(n) = denominator of b(n), where sum{m>=0} b(m)*x^m/m! = x/(sum{m>=1} H(m) x^m/ m!) = exp(-x)*x/(sum{m>=1} x^m (-1)^(m+1)/(m!*m)). (H(m) = sum{k=1 to m} 1/k.).
Terms
- a(0) =1a(1) =4a(2) =72a(3) =96a(4) =21600a(5) =17280a(6) =5080320a(7) =322560a(8) =326592000a(9) =145152000a(10) =63228211200a(11) =22992076800
External references
- oeis: A128062