G.f.: 1/(1 - x*F'(x)/F(x)) where F(x) = Sum_{n>=0} x^n/n!*Product_{k=1..n} (k^2 + 1).
A262001
G.f.: 1/(1 - x*F'(x)/F(x)) where F(x) = Sum_{n>=0} x^n/n!*Product_{k=1..n} (k^2 + 1).
Terms
- a(0) =1a(1) =2a(2) =10a(3) =60a(4) =400a(5) =2900a(6) =22700a(7) =191600a(8) =1746400a(9) =17230000a(10) =184348000a(11) =2140118000a(12) =26925784000a(13) =366118706000
External references
- oeis: A262001