G.f.: 1/(1-x) = Sum_{n>=0} a(n)*x^n / Product_{k=1..n} (1 + n*k*x).
A201007
G.f.: 1/(1-x) = Sum_{n>=0} a(n)*x^n / Product_{k=1..n} (1 + n*k*x).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =12a(4) =162a(5) =4020a(6) =161190a(7) =9580200a(8) =794045490a(9) =87732586200
External references
- oeis: A201007