E.g.f.: exp( x*(1 + 2*x) / (1 - x - x^2) ).
A345075
E.g.f.: exp( x*(1 + 2*x) / (1 - x - x^2) ).
Terms
- a(0) =1a(1) =1a(2) =7a(3) =43a(4) =409a(5) =4441a(6) =58351a(7) =872467a(8) =14776273a(9) =278033329a(10) =5759752951a(11) =130094213371
External references
- oeis: A345075