E.g.f.: 1/[ Sum_{n>=0} (-x)^(n*(n+1)/2) / A000178(n) ] where A000178(n) = Product_{k=1..n} k!.
A198892
E.g.f.: 1/[ Sum_{n>=0} (-x)^(n*(n+1)/2) / A000178(n) ] where A000178(n) = Product_{k=1..n} k!.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =9a(4) =48a(5) =300a(6) =2280a(7) =20580a(8) =211680a(9) =2434320a(10) =31134600a(11) =438807600a(12) =6744276000a(13) =112237725600
External references
- oeis: A198892