a(n) = n! * [x^n] exp((1 - 2*x)/(1 - 3*x + x^2) - 1).
A188365
a(n) = n! * [x^n] exp((1 - 2*x)/(1 - 3*x + x^2) - 1).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =43a(4) =505a(5) =7421a(6) =130501a(7) =2668975a(8) =62197073a(9) =1626103225a(10) =47116726021
External references
- oeis: A188365